3500 Swap

[xLeGeNDx]

Alright so, the car is a 1992 Grand Prix SE. That has been engine swapped with a 3.4L DOHC running on a 94' OBD 1.5 engine harness and a 4T60-E transmission with a dash/door panels from a 94' CS (I still dislike the older grand prix dash with a passion!)

I'm looking at the 3500 to replace the 3.4L DOHC when the DOHC decides to crap out on me. Now with me being on OBD 1.5 I figured i got a lot of room to play with here. Either I can downgrade to OBD I or I could upgrade to OBD II. Which at this point im not to sure on which way to go or which way would be better with a 3500. What all would I need to grab for the swap to make it compatible to use in the car? Currently the car runs everything to make it DOHC friendly, like Custom ran fuel lines, Complete power steering line setup, AC lines, and other stuff.

[3400-95-Modified]

well if your keeping the 4t60e then that limits you to the A-body OBDI system, or going OBDII... Also I would figure out which tuner you can get easily and cheap and then decide.... HPTuners isn't cheap, DHP's can be had used for not bad, and then everything needed to do OBDI isn't that expensive gets a little more if you don't feel like pulling the chip every time to flash and want a realtime adapter.

So really the choice is yours.

[xLeGeNDx]

I wouldnt mind keeping the 4t60e but not necessarily, i would prefer to use the newer trans along with the motor in stock form. I would probably go OBD2 i would just need to get an engine harness. I already have a 96' Buick Regal 3100 PCM that i could work with.

[SappySE107]

I will never ever ever tell anyone to ever use OBD2. Ever. The 91-93 3.4 DOHC computer might work for your 94 4T60E. i think it will simply not use the extra temp sensor and whatever that transmission has that the 93 wouldn't.

[xLeGeNDx]

Something to look into as well. Since i been out of the computer game for a while im not up to par on the difference between OBD 1 and OBD 2 these days other then one running on MPFI and the other on SFI and that i could pull codes on OBD 1 without anything special.

[3400-95-Modified]

If you have an OBDII tuning suite then you can pull codes on that as well... and universal obdII code readers are only $35 with software. OBDII also will typically use a MAF fueling system verses speed density but that is dependent upon the application, and obviously tables are a bit different depending on which ECU you go with as well, some have higher resolutions, or larger ranges and so on.

I have a feeling that the OBDI is god statement will stick around for a while just like how Carb's are god with the old hot rodders did... I can't understand why someone would NEVER EVER recommend OBDII maybe I'm missing the reason why it's the devil....

I'm not trying to push it because really the choice is yours depending on what you want to do/spend/have for equipment, and your personal preference and comfort level with the system, I'm just giving you some info on what it would take to go OBDII.

[SappySE107]

I have a feeling that the OBDI is god statement will stick around for a while just like how Carb's are god with the old hot rodders did... I can't understand why someone would NEVER EVER recommend OBDII maybe I'm missing the reason why it's the devil....

I have tuned OBD1, OBD2, Old haltech, new haltech, AEM, megasquirt, and probably a couple I am forgetting. OBD2 is the last choice for me. If your car is stock OBD2, then fair enough. If its not, I don't recommend swapping to OBD2. Less tuning options, more sensors, less hp at the wheels compared to running a different system, and more expensive than an OBD1 swap/tuning setup. OBD1 can run a 3 bar MAP. Good luck with a V6 OBD2 system that isn't possibly a 3800. No one cares about us using OBD2. HPTuners barely supports us compared to the LS market. If you have an LS, then OBD2 looks like a good setup. Since this is 60DegreeV6.com, I will stick with my opinion that OBD2 sucks.

[xLeGeNDx]

Fair enough, the car original was OBD 1, but for the 3.4L out was best to do OBD 1.5 since I had a complete parts car at my disposal, I would love to start learning to tune which would be a whole didn't thread, I don't have access to any OBD 2 software. If I go the OBD 1 route would I be able to keep the 94 trans or would I need to get 91-93 trans?

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[AleroB888]

............ HPTuners barely supports us compared to the LS market. If you have an LS, then OBD2 looks like a good setup. Since this is 60DegreeV6.com, I will stick with my opinion that OBD2 sucks.

Are you as a vendor able to have HP Tuners make a custom program (that doesn't suck)? I realize it would be quite expensive, but are they even willing to do it?

[SappySE107]

Simply put, no. If you want a real tuning solution, go aftermarket.

[3400-95-Modified]

If you want a real tuning solution, go aftermarket.

I don't disagree with that statement one bit.

[xLeGeNDx]

So heres what im thinking.

the 3500
94' 4T60-E
Run it on OBD I with a 91-93' DOHC ecm, (referencing a 93' DOHC to a 94' wiring diagrams it appears to be almost the same setup)
Would need an OBD 1 DOHC engine harness and an OBD 1 interior harness from lets say a cutless vert (i wanna keep the digital climate)

What would be needed to make the 3500 OBD 1 compliant? i know the EGR will be different then some things on the wiring harness itself will have to be removed/re-routed, a new throttle boddy, or i could use the 3400 upper intake.

[xLeGeNDx]

Looking at the wiring diagrams between 93 and 94 would the 94 4T60-E be compatable on the 93 wiring? it looks like it would work, but at the same time it looks like theres a bit of a difference between the drivers. anyone got an idea on this?

also if thats the case, could the 93 be tuned to work with the 94 trans? or will i need an older 4T60-E?