Performance goals

[robroyoldboy]

Ok, there are probably a few other posts with this information on here, but I didn't find them with the search function. So here goes:

I am looking at getting a 99 SSEi that needs has an engine knock, and an '85 Fiero with a 4-speed. My thoughts are this: I got some good help on a good place to find 3800 supercharged engines from junkyards, so I'll replace the one from the bonneville with a good running junkyard engine. Then I have a spare engine that I could put into the Fiero.

So here's the real question: what would it take to get a 3800 Series 2 supercharged to make 350hp still running on pump gas? I invite all different routes to this goal, and if you can point me to a previous thread, please point me to it!

[Bonnefied_GM]

I can only begin to imagine how easy it will be for you to find this information. Modding a Sll L67 is such a popular undertaking by owners of said motor and I know there's a few good writeups online about modding 3800 motors as far as what mods are available and common bolt-on stuff.

Here's one write up, but it's geared towards Grand Prixs:
http://www.grandprixforums.net/safely-m ... 17482.html

[00Beast]

Basically:

Cam
Intercooler
Ported S/C (preferably Gen V)
Headers
Larger Injectors Possibly
Good Tune

Like I said in another thread earlier today, even for the fiero, you're best bet is to find a JY engine. Rebuilding a 3800, unless you're going for huge power (even then) is an exercise in poorly allocating funds. You'll spend $1500 on rebuilding a decent donor, or $750 on a good running L67, and have that much more to allocate to your mods.

[willwren]

For the Fiero, you're far better off with a 94/95 Series 1 L67. They are quicker on the 1/4 than the Series 2, and fit the Fiero with fewer problems.

[robroyoldboy]

How is it that an engine that starts out heavier with less torque and HP in a larger external package but the same displacement can be a better performer, and fit into the engine bay more easily?

And just how much heavier is the series 1 anyway? I can't imagine it to be much heavier, but because the series 2 is a short-deck version of the same thing I know it is.

[willwren]

The weight difference is negligible. The 94/95 Series 1 are quicker on the 1/4 mile for several reasons:

1. While they don't deliver 240hp, it's torque that rules the 1/4 mile. 240hp vs. 225hp isn't much of a difference. In addition, the S1 reaches that HP peak at a lower RPM (5000 vs 5200), getting it into the bottom of the next gear quicker to gain the advantage of torque at the bottom of each gear quicker.
2. In the torque department, the 94/95 produces 275 vs the S2's 280, The 94/95 Series 1 delivers that torque peak at a more desirable 3200 rpm's vs the 3600rpms of the S2.
3. The Gen3 M62 spools faster than the M90, getting you into boost quicker and having a profound effect on your 60' and 0-60mph times.
4. The 94/95 L67 actually has a larger throttle plate than the S2.
5. The 94/95 L67 has far less torque-management programmed into the PCM.


AND:
6. The shorter nosedrive (snout) and accessory bracket configuration of the 94/95 fit the small confines of the Fiero's engine bay better than the Series 2.

The differences in 1, 2, and 4 above are slight, but when combined together make a bigger difference. #3 and #5 are more significant. Go drive one of each in good condition and you tell me which one has the power off the line and gets into boost quicker.

[robroyoldboy]

I'll have to see if I can find an example of each to test back-to-back as you suggest. Sounds like fun...

Now, with it going into a Fiero, I don't think I'll notice much of the difference should I go with a s2, considering that in pure stock trim it has 100hp and more than 100lb-ft more than the engine that started there! It's already going to be a screamer, I just want it to run low 12s or high 11s!

[01bonneSC]

Turbo Fiero
http://www.gmtuners.com/87fiero/87fdrive.htm

Another site
http://www.fastfieros.com/turnkey_solut ... nstall.htm