3.4 rwd 3400 hybrid?

[92ratt10]

well this is my first post on this forum. im am currently in the middle of a 92 s10 that i am putting on air ride. and ill soon be starting work on my engine. but i need a little help being new to these engines (yea i was a honda guy for a few years) anyway. im stuck on ideas right now. first i was going to swap the 3.4 in and reuse my ecm, 4.3 tb and injectors, 272 cam, headers, intake manifold, and some ignition work. this seems to be my easyest and cheapest way to power my truck. next i though of swaping the whole 3.4l harnest and ecm and doing all the same mods but the tb and intake (duh!).

ive heard of the 3.1 with 3x00 top end swap for a while but i was wondering if there is any info on a rwd 3.4 3400 hybrid. i know raven did the 3100 on the 2.8 but id like to use a 3.4 block instead. i would still put a cam and headers in the mix. and i read i need to use the 3400 pistons, on what about this 3500 uim swap too? but my question would be making every thing run. would i have to use the ecm from the camaro? oh yea on key piece of info its a 5 speed trans too so i know i would need a ecm from a 5 speed 3.4l camaro. but would i need to run a differant prom to make it all work specially with the cam? and also would this even be worth the hassle to do this or should i just not waste my time? i figured some one on here could help me with this.

-veto-

[Guest]

Yeah if I could have, I would have started with the 3.4L RWD block as well, but they are hard to come by around here, well for a decent price anyway.

The use of the 3.4 block eliminates the need for a custom crank trigger, that I had to make.

As for running it, you could use the 3.4 PCM, the only issue ther eis bypassing the VATS system, whihc isn't overly difficult and there are a couple ways to do it.

I used an ECM from an '88 Cavalier, even used the stock PROM for some testing, and it would have ran well, but not optimum.

I would suggest using the FWD ECM, as this will give you better ability to tune the combination afterwards, AFAIK, no one has still yet hacked the 3.4 PCM completly yet.

You could use the 3500 top end or UIM, it will bolt onto the 3400 LIM.

[92ratt10]

yea i saw the crank trigger you made. did look to hard but i have a 3.4l for $300 lined up. (tons of them around here) so i figured that would be a better start then the 3.1 block. i was just trying to get a little more power if the turbo setup didnt go the way i wanted and i was forced to build a NA 3.4. and i heard ofthe head swaps so i figured why not on a 3.4 block. but with the fwd ecm and me running a 5-speed wouldnt i have a problem running that set up. or do you know of a way to patch the ecm to work with out seeing the transmission signals?

oh and do you happen to know the cr this combo would have. ive heard some one say to use the 3400 pistons to lower it becasue they are more dished? any word on if thats true

[Guest]

You don't want to get rid of the VSS, whihc is the only tranny connection on a manual equipped version, in this case, since it will help control fueling and spark tables, under accel and decel, making for higher drivability and better economy, with less issues overall.

You're best off getting a BSS to work. There might be a way to use the original optical sensor and trigger the FWD ECM, but didn't have the time or even desire to do so. I quickly tried the optical sensor plugged direvtly to the VSS input on the FWD ECM, but it didn't work. I had a scanner to verify this.

Yes the 3400 pistons have a larger dish than the 3.4 pistons and will yeild a 9.6:1 SCR, using the aluminium head head gasket (required) and stock, non-planed or worked heads.

[92ratt10]

well yea of course the ecm needs to see the speed on the vehicle i know that much, 2 yrs of automotive college so i got the basics im just new to performance mods on these engines. but i think im going to call it off on the head swap for my truck. but i think a differant project down the line like a 3.4 turbo chevett was sounding fun the other night as me and my roomate where having a few beers.

so im guessing the fwd ecm and the s10 dont use the same referance voltage, and resistance for the vss becasue with my tranny having it electric i was hoping to re use it and just wire it in.

[Guest]

Wait, I though for some reason you said '86 S-10, So you'rs has a 2 wire VSS? Purple and Yellow wires?

[jwvess00]

Hi there!

A stock-rebuild 3.4 Donormaro engine with a cam swap (i.e. HT3.4 crate cam, Crane 260, or Crane 272), plus a bigger TBI on a stock ported intake is a popular swap. Similar (or somehwat better) power than a 4.3 TBI with less weight. This is probably the fast path to a 3.4 in your truck. http://forums.s-series.org can help a lot with this.

Or for more fun, build a 3.4 with a GenIII top end like you've described. You'll need to use a port injection system since there is no TBI intake for the GenIII heads.

3.4 block, 3400 pistons, 3400 top end (or 3400+3500 mix) would be the hardware. Keep the 3.4 RWD DIS ignition.

Unless I kept the 3.4 stock, I'd ditch the SFI PCM since I know of nobody hacking it. If someone has, please post! I'd go with a GenII MPI ECM and harness -- they're plentiful (i.e. W-body or J-body 3.1 car from '91-'94 would be a good choice) and they're hacked.

I'd use a FWD ECM (1227730, 16196404, etc.) and the latest code I could run on it for a V6/60 (i.e. BFUZ, which is for a '94 3.1V6 MPI 5-speed Federal emmissions). If I remember correctly, this code has a bit in it to tell it whether there's an optical VSS or magnetic VSS. Your 2000 PPM VSS will connect to the '730 (I'd have to look up which pin it is, it's a different pin than the magnetic VSS), so proper wiring + setting the right bit should get you there. Ben could tell us more, probably.

[92ratt10]

no its a 92 s10. im not to sure on the wire colors because my truck is a bare frame right now and every thing is packed away in boxes.

thanks alot for the info. but im going to ditch the 3400 top end swap on my truck and save it for another project. im going to just rebuild the 3.4 with a 272 cam 4.3 tb, port to match IM, headers, and some simple upgrades to the ignition and all that. any one know how well this wil do on emissions because i have testing in my home town. shitty i know!

[jwvess00]

Hi there!

As a reference, by '92 GM was using a magnetic VSS on the S-series trucks, so you wouldn't have any trouble swapping in a MPI or PFI ECM from a VSS perspective.

[fivepointhustla]

Has anybody completed this swap? What were the gains? Was it worth it?

[bszopi]

I'm sure there have been at least a couple, but I know Russell (94Camaro) was probably the first to do it. Do a search for some of his posts and he'll talk about his gains and such.

[Camaro95V6]

Could some of you please help me? I have a 1995 Chevrolet Camaro w/ the 3.4l V6 engine. I've heard of Russel who did the 3400 top end swap. After seeing the gains that he got, I was very interested in the swap. I wanted to learn more about the 3400 and I ended up coming across some info about the 3500, and how it was based off the same design. I've asked several people if the 3500 top end swap was possible with the RWD 3.4 engine, and got the response that the 3500 top end was too tall to fit under the cowl. The reason for this, from what I've heard, is because the upper intake is taller than the 3400 upper intake. Basically I'm here to see if anyone can provide any other information for this? I came across this:

http://60degreev6.com/store/index.php?act=viewProd&productId=59

That package uses the 3500 heads and lower intake, but uses the 3400 upper intake. I was wondering if this would solve the problem of the 3500 top end not fitting under the cowl?

[Camaro95V6]

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[Camaro95V6]

Anyone?

[Camaro95V6]

^.^?