TBI to CSFI?

[Boulky12]

I have a 1993 S10 2.8 TBI that I'm swapping a 2000 Vortec 350 CSFI into.

I have both harnesses.

Can I wire things like my ignition, Gauges, headlights, tailights to the 2000 Harness?

Can I use my stock TBI Fuel pump?

Basically is it even possible or am I gonna have to throw a carb on it?

I'd really appreciate the help. Thanks

[jim_in_dorris]

If you have the 2000 vortec CSFI ECM, then it should be fairly easy, the stock TBI pump won't put out enough pressure though.

[Boulky12]

If you have the 2000 vortec CSFI ECM, then it should be fairly easy, the stock TBI pump won't put out enough pressure though.

Thanks for the quick reply!

I do have the ecm.

So all I would need is a fuel pump that puts out more pressure?

Do you think it would be worth changing the pump and keeping the CSFI?

Thanks.

[Fast355]

Thanks for the quick reply!

I do have the ecm.

So all I would need is a fuel pump that puts out more pressure?

Do you think it would be worth changing the pump and keeping the CSFI?

Thanks.

The CSFI is JUNK! Have had nothing but problems with mine and converted it to a marine intake with real injectors on the outside of the intake.

[Boulky12]

The CSFI is JUNK! Have had nothing but problems with mine and converted it to a marine intake with real injectors on the outside of the intake.

Well that's good to know. I am trying to do this by spending the least amount of money possible. So I'm trying to work with what I have.

Thanks for your input.

[PJG1173]

what transmission are you running behind this? I converted my CSFI 350 to TBI because of the reason Fast355 mentioned and it wouldn't support the demands of my engine mods. If your 93 is already setup for TBI this may be an easier conversion.

[Boulky12]

what transmission are you running behind this? I converted my CSFI 350 to TBI because of the reason Fast355 mentioned and it wouldn't support the demands of my engine mods. If your 93 is already setup for TBI this may be an easier conversion.

4L80-E. Truck was originally a 2.8 TBI and still has the stock fuel pump.

I appreciate your help!

[1project2many]

The CSFI is JUNK! Have had nothing but problems with mine and converted it to a marine intake with real injectors on the outside of the intake.

I don't like them either. But fwiw statistically they have done fairly well in our fleet and we've got several of these systems running with 300k to 350k miles on them. Problems occur in our fleet with chafing in the wiring harness and pitting corrosion and the ends of the manifold these days. Several years ago we had to replace all the intake gaskets as the silicone end seals cracked from Death-Cool. Fel-pro makes a good gasket that solves this problem.

Now if you're planning to make any decent power upgrades skip CSFI and go for a different manifold.

Now if you want to talk F*rd 6.0 Diesels, well, those are pure gahbage.

[Boulky12]

I don't like them either. But fwiw statistically they have done fairly well in our fleet and we've got several of these systems running with 300k to 350k miles on them. Problems occur in our fleet with chafing in the wiring harness and pitting corrosion and the ends of the manifold these days. Several years ago we had to replace all the intake gaskets as the silicone end seals cracked from Death-Cool. Fel-pro makes a good gasket that solves this problem.

Now if you're planning to make any decent power upgrades skip CSFI and go for a different manifold.

Now if you want to talk F*rd 6.0 Diesels, well, those are pure gahbage.

Well the guy I bought the wrecked donor truck from said the motor was rebuilt with 25,000 on it. Odometer was 225,000. When I checked it out she was running great and all fluid levels were good. So I think I'm alright as far as reliability for now.

And as far as power, its gonna be in an S10, and this is my first swap, so it'll be plenty for me!

The part I'm stuck at is should I keep my TBI Fuel pump and converted the motor to TBI?

Or keep the CSFI on the motor and change the fuel pump for CSFI?

Or just carb it?

Which would be cheapest?

Thanks. This site is awesome

[Boulky12]

Also I still have the donor truck so maybe I could take the fuel pump out of it and put it in the S10 and run the CSFI.

Is that an option?

Thanks.

[Nasty-Z]

I'll throw my .02 in for keeping the TBI setup , dead on reliability , still OBD1 so it won't cost a fortune to tune and will support good power levels depending on how "Creative" you get with mod's and tuning .

I currently have 2 S-10's as daily drivers , both TBI , both running the 94-95 16197427 PCM .

'92 S10 2WD , 434 Shafiroff SBC , 3550 Tremec :

http://i684.photobucket.com/albums/vv202/Nasty-Z/IMAG1010.jpg

'84 S-10 Blazer , 496 BBC , 700R4 :

http://i684.photobucket.com/albums/vv202/Nasty-Z/S-10%20Blazer/WP_20131223_001_zpsca4d2691.jpg

Big TBI fan here :happy:

TOM

[Boulky12]

I'll throw my .02 in for keeping the TBI setup , dead on reliability , still OBD1 so it won't cost a fortune to tune and will support good power levels depending on how "Creative" you get with mod's and tuning .

I currently have 2 S-10's as daily drivers , both TBI , both running the 94-95 16197427 PCM .

'92 S10 2WD , 434 Shafiroff SBC , 3550 Tremec :

http://i684.photobucket.com/albums/vv202/Nasty-Z/IMAG1010.jpg

'84 S-10 Blazer , 496 BBC , 700R4 :

http://i684.photobucket.com/albums/vv202/Nasty-Z/S-10%20Blazer/WP_20131223_001_zpsca4d2691.jpg

Big TBI fan here :happy:

TOM

Beautiful setups man.

I like that I'll be able to keep the OBD1 and that I won't have to swap the fuel pump so I think that's what I'm leaning towards as of now.

I appreciate your input.

Thanks.

[Fast355]

Beautiful setups man.

I like that I'll be able to keep the OBD1 and that I won't have to swap the fuel pump so I think that's what I'm leaning towards as of now.

I appreciate your input.

Thanks.

You will still need to swap the pump as the stock TBI pumps barely keep the stock engine fed with fuel.

[Nasty-Z]

Yup,

Still need to swap the pumps , the Edelbrock 3581 is a reboxed Walbro 255 lph pump that works really well in a non stock TBI application

http://www.summitracing.com/parts/edl-3581

TOM

[PJG1173]

You will still need to swap the pump as the stock TBI pumps barely keep the stock engine fed with fuel.

^X2, to support the fuel demands I had to cannibalize a vortec sending unit for the pump and put it in my S10. which if you have the donor vehicle you could use the pump out of it. using a 4L80e will still need to be addressed but I think a couple of people cracked that nut with the 7427 computer on a newer 4l80e

[Fast355]

^X2, to support the fuel demands I had to cannibalize a vortec sending unit for the pump and put it in my S10. which if you have the donor vehicle you could use the pump out of it. using a 4L80e will still need to be addressed but I think a couple of people cracked that nut with the 7427 computer on a newer 4l80e

After about 93 the 4L80Es are the same as the newer ones up to about 05ish. The TBI 5.7/4L80E came as a powertrain and used the 7427 pcm.

[Boulky12]

^X2, to support the fuel demands I had to cannibalize a vortec sending unit for the pump and put it in my S10. which if you have the donor vehicle you could use the pump out of it. using a 4L80e will still need to be addressed but I think a couple of people cracked that nut with the 7427 computer on a newer 4l80e

Dang well since I can't use the stock pump will the CSFI pump from the Full Size(donor) fit in the S10 Gas Tank?

Will the 4L80-E still be an issue even if I have the Harness and Computer from donor?

Thank you guys so much for the info.

[1project2many]

S10 wiring from 2.8 to 5.7 could require a bit of thinking but I'd also vote to go TBI. GM wiring for S10 trucks doesn't always match diagrams. Be prepared for some "What the heck?" moments. I believe the pcm from a 93 S10 with 4L60E and 4.3 is the same as the 94-95 V8 C/K trucks and if you get the TBI 4.3 V6 harness it should reduce the amount of rewiring necessary. You'll need a V8 chip (called a memcal) and you will need to find or build a calibration to burn onto the chip because the stock 5.7 TBI calibration is not correct for the L31 engine with TBI.

[Boulky12]

S10 wiring from 2.8 to 5.7 could require a bit of thinking but I'd also vote to go TBI. GM wiring for S10 trucks doesn't always match diagrams. Be prepared for some "What the heck?" moments. I believe the pcm from a 93 S10 with 4L60E and 4.3 is the same as the 94-95 V8 C/K trucks and if you get the TBI 4.3 V6 harness it should reduce the amount of rewiring necessary. You'll need a V8 chip (called a memcal) and you will need to find or build a calibration to burn onto the chip because the stock 5.7 TBI calibration is not correct for the L31 engine with TBI.

Yeah the more I read about the CSFI the more it seems like people are not very fond of it.

What all would I need for the TBI Conversion? New Intake, fuel pump, 4.3 TBI v6 harness, memcal?

[bybyc5]

The vortec heads require a vortec intake. Bolt pattern, port size and placement are a bit off from the older 350 motors. Limiting a retro intake swap/conversion from an older TBI motor. Unless you were to use the older heads, which don't perform like the vortec's.

Also, what about an inline booster pump, using the stock in tank pump for as a lift pump? I think you can get a 255L walbro inline kit for about $100 or so. I used this on my TPI system for my K1500. Works great.

[Boulky12]

Also, what about an inline booster pump, using the stock in tank pump for as a lift pump? I think you can get a 255L walbro inline kit for about $100 or so. I used this on my TPI system for my K1500. Works great.

So your saying that theirs pumps that help fuel pumps boost pressure?

[1project2many]

I've used a pump from a 90's Ford truck with 460 and PFI as an inline booster in the Vortec vans before. It extended the time between in tank pump replacements.

[bybyc5]

Yes. My truck came stock with a 350 TBI and it barely gave me 22 psi maxed out. My TPI system needed at least 39 lbs.
I believe this is the one I bought a couple years ago, although the price went up a few dollars.

http://www.amazon.com/Walbro-GSL-392-Pressure-400-939-Installation/dp/B0051UH656/ref=sr_1_fkmr0_1?ie=UTF8&qid=1435851699&sr=8-1-fkmr0&keywords=inline+booster+pump+kit+walbro+255L

But it works perfectly well inline as a booster pump with my low pressure TBI in tank pump. I used quality high pressure fuel line designed for fuel injection systems and spliced it into my fuel rail feed line. Wired it to it's own fuse protected circuit with a relay triggered by the existing stock fuel pump relay circuit.

[Nasty-Z]

I may be in the minority here , but as I read this I ask , why reinvent the wheel here ? The pump is in the tank for a reason , there are drop in replacements for it , just like the one I linked in one of my earlier posts .

I simply do not see why one would not simply swap the factory in tank pump for a hi flow aftermarket version , simple to do and eliminates all of the additional wiring / plumbing by adding inline "booster" pumps or whatever they can be called.

If cost is a factor or the reason not to do the 255 LPH Walbro , the E3270 Airtex will support semi mild combos , has 225 + LPH flow rate and is under $75 at most parts stores.

TOM

[PJG1173]

Dang well since I can't use the stock pump will the CSFI pump from the Full Size(donor) fit in the S10 Gas Tank?

Will the 4L80-E still be an issue even if I have the Harness and Computer from donor?

Thank you guys so much for the info.

Yes if you take the pump out of the newer sending unit it will fit in the s10 sending unit no problems. I used the pump out of a 2000 suburban in my 93 s10. If you are going to stick with the TBI changing the pump is ONLY a precaution and not necessarily a requirement. I only changed mine because it could not push the 20 psi I was trying to get out of it where the stock vortec pump would. I just recently purchased an aftermarket pump that is supposed to operate 15~100psi because I switched to MPFI and needed the additional pressure.
when I swapped a 97 suburban csfi 350 into my Toyota using TBI I used one of these intakes:
http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=professional+products+vortec&_sop=15
I specifically used this on since I am a fan of Air Gap intakes.
http://www.ebay.com/itm/Professional-Products-SB-CHEVY-VORTEC-CROSSWIND-SATIN-52028-/231528002607?hash=item35e824f42f&vxp=mtr
then I used one of these to adapt a 454 TB
http://www.jegs.com/i/Holley/510/17-45/10002/-1?CAWELAID=1710523436&CAGPSPN=pla&catargetid=230006180000848202&cadevice=c&gclid=CLnZo8b5vMYCFdgIgQod5i0JRw

[Boulky12]

Yes if you take the pump out of the newer sending unit it will fit in the s10 sending unit no problems. I used the pump out of a 2000 suburban in my 93 s10. If you are going to stick with the TBI changing the pump is ONLY a precaution and not necessarily a requirement. I only changed mine because it could not push the 20 psi I was trying to get out of it where the stock vortec pump would. I just recently purchased an aftermarket pump that is supposed to operate 15~100psi because I switched to MPFI and needed the additional pressure.
when I swapped a 97 suburban csfi 350 into my Toyota using TBI I used one of these intakes:
http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=professional+products+vortec&_sop=15
I specifically used this on since I am a fan of Air Gap intakes.
http://www.ebay.com/itm/Professional-Products-SB-CHEVY-VORTEC-CROSSWIND-SATIN-52028-/231528002607?hash=item35e824f42f&vxp=mtr
then I used one of these to adapt a 454 TB
http://www.jegs.com/i/Holley/510/17-45/10002/-1?CAWELAID=1710523436&CAGPSPN=pla&catargetid=230006180000848202&cadevice=c&gclid=CLnZo8b5vMYCFdgIgQod5i0JRw

Well I decided that I will use the CSFI system because I already have it. And I'll use the fuel pump from the truck it came in again, because I already have it. Motor was running good before I pulled it so maybe when it takes a shit I'll switch to TBI.

Thank you for answering that question. I would rather just swap in the Full Size pump because I don't have to spend more money. And I know it'll run at exactly the psi needed for the CSFI (bout 60-65 psi)

Thank you all for the great info.

[1project2many]

Yes if you take the pump out of the newer sending unit it will fit in the s10 sending unit no problems.

93 has old style pump. 95 Blazer CSFI even had old style pump. Good for 60 psi plus.