99 GTP -> 3400

[pendan]

Rhedalert Posted:
Another 3800 caught fire huh?

Yeah man, i think its funny because about a month ago i seen a Bonneville for sale on the net that caught fire too

I wonder whats up with that??

Canada Posted:
Beings that Grand Prixs have that nasty ghetto booty.....the 240 hp engine is the way to go. I honestly have no idea why you would want to put a 3400 in a GTP....

Well i figured since this is a 60 degree forum, maybe i would find good arguments here to convince me to put a 3400 in a GTP rather than a 3800SC since everyone says they - 3400 - are superior over the latter in every way shape and form..

BTW..
SEs got 3100s.
GTs got 3800s.
GTPs got 3800 SC....SC stands for supercharger.

lol..... Yeah i know it stands for supercharger

Also i just figured since a 3400 has 215 hp n/a, and the Series II 3800 has only 205, (but gobs of torque at low rpms) maybe i could modify it to out perform a 3800.. i also like DOHC's, for mainy reasons but more that it is a modern engine design

I guess maybe i should of stated that im looking more for peoples opinions to justify going the 3400 route over a 3800

Thanks,
Matt[/quote]

[SappySE107]

the 3.4 DOHC has 200-215, but the 3400 is a pushrod rated at 180. Ok, DOHC is a whole different animal then, and would change my mind on the value of the swap. Now, the L67 is still easier since its all stock drop in without rewiring. The 96 DOHC setup might use most of the wiring but the computer has to be changed as well.

The DOHC is a high RPM screamer with lots of untapped potential. There are a few boosted but none are really all out modded with the boost yet. The L67 has the torque and is more reliable and a better aftermarket. If you have tools and have confidence that you can work on a car...the DOHC isn't really much of an issue for doing work on it.

#1 problem, auto trans. Perhaps the 4T65-E can handle the high RPM better than the 4T60...but I have no faith in them for performance anyway. You would need a higher stall converter and a better FDR. The DOHC loves close ratio gearing...and the 5 speed just owns for that.

[pendan]

Oh! I thought the 3400 was the DOHC engine.. hehe oops

Thanks for correcting me!
So you would consider the 3.4 DOHC as a better alternative to the 3800?
Can you give me more detail on the transaxle? How hard is it going to be to wire up the 3.4 DOHC to the existing 3800 wiring??
I believe it has the 4T65E-HD transaxle

What kind of performance can i expect to achieve out of the 3.4 DOHC anyway?
Well anywho i called the guy, he said he may have a buyer who is comming to look at the car, but if it doesn't go through i will hear from him.
I hope the guy doesnt know its burnt
then its allll mine mmmm hehe

Im assuming insurance would probably be cheaper as it was previously burnt and its value must have gone down from that?? actually knowing htem they would probably raise the cost because i bet they would think it is more likely to happen again... those pricks

[SappySE107]

I dont know how to wire up that trans , nor how the 3800 wiring is compared to the DOHC. I don't know of anyone who has done it so your best bet would be to get the 3800 wiring diagram and compare it to the DOHC wiring. You have some choices for wiring too on teh DOHC end so thats up in the air right now.

Power output, the sky is the limit. No one has really gone all out with this engine that I am aware of, so the power you want is up to you in terms of money and time spent on it. 300 NA shouldn't be a problem, boosted, the sky is the limit as far as I am concerned.

[Cliff8928]

From what i have seen, the last year of the DOHC (97) has the 4T65-E... so that should help some of the wiring issues..

Cliff Scott
89 BerettaGT
89 Volvo740

[Anonymous]

I could have sworn the 97-2002 had the 3400 option, guess I am wrong. I can't believe they would put the 3100 in such a big car

[Rhedalert]

It's by no means slow. My dad's 02 GPSE can hold its own pretty well. Only thing I can't find are any test #'s of a 2000+ 3100 w-body from any magazine.

[pendan]

Well im still waiting for his call, i hope he didnt sell it because man ill be sad..

Hrmm 300 N/A now that is pretty sweet, in the future i will probably do a custom turbo job because its the only way to go! Fuel economy, plus more power
I woud like 300 n/a though
I dont think the 4t65e - hd can handle that much power htough i think its only rated for 240 max or something, i forget exactly where i read this though i think it was on the GM website. There are quite a few options available from thrasher and domestic performance that i have found for performance transaxles. A little pricier than i can afford i might add...

anyone want to give me a loan?? hehe

[patgizz]

a pushrod 3400 would be an easy swap because impalas got them

[brian89gp]

I am thinking that OBDII wiring is very standardized. I remember hearing that a L67 swap into a 96 Grand Prix (OBDII) the wiring basically plugged in, I would imagine a 96 DOHC into a 97+ would be the same. A DOHC in a 97+ engine bay may actually be easier to work on as they have more room underhood.

For the transmission, a stock 4t65HD would probably be alright as long as you try not to constantly rev the piss out of it. Still stock a 4t60e lasts what, 60-80k if severely beaten? I have spoken with Intense and they are confident that their tranny could hold whatever power and at least 7000rpm from the DOHC.

Since DOHC's tend to be black sheeps and the L67 a popular swap, a DOHC might be cheaper as nobody wants one.

Anyone know what mounts the 3800 uses? is it a single motor mount or dual like the DOHC? Making sure that the subframe has the double motor mount before buying an engine might be wise

In the end it comes down which engine you want: a torquey L67 with abundant aftermarket, or a high revving DOHC with gobs of potential but no market?

[pendan]

Hence the main purpose of this post....
For you people to help me decide which route to go.....

[pendan]

Well the car is sold... FUCK
Well i'll be looking for another deal like that, and i hope i will come across one in the not to distant future. Maybe then i can go for a 3.6 VVT instead of either a 3.4 DOHC or 3800!

Anyone got any specs on that engine? Im really curoius about it

~Matt

[RidgeRunner]

Specs on the 3.6?

http://60degreev6.com/index.php?p=sections&sid=32