Max boost for an L32 from a supercharger

[JohnnyC]

I am looking into a supercharged L32 setup rather than a turbo setup. I am just curious as to how much boost I can throw at an L32 from a paxton, vortech or the likes... I like the idea of an intercooled supercharger also, and I am assuming I will have to run a cam with different lobe separation and the whole nine yards in order to not have the air/fuel forced back out through the exhaust... Any suggestions or advice would be greatly appreciated, hoping to get this show on the road soon :)

[blown00]

Re: Max boost for an L32 from a supercharger

L32 as in a 04+ grand prix motor? Or the old 3.4L L32?

zzp runs 30psi on a stock L36. they went many passes in 9's 10's 11's til it broke and just replaced with another stock one. L32 has forged rods though, if you mean 04+

edit: 30psi turbo'd that is

[JohnnyC]

Re: Max boost for an L32 from a supercharger

Definitely looking into the 04+ gtp motor, minus their heads, intake manifolds and supercharger of course. I have my own set of heads off an L36 getting ported and polished, I am assuming these will bolt up to the L32, along with the upper/lower intake manifolds from an L36. I'm thinking of some type of 6500-7000RPM cam and a supporting valvetrain as well.

Ha, never though of those L36s being that strong. I'm thinking maybe 15# on the L32

[UDLOSE98]

Re: Max boost for an L32 from a supercharger

Im in the final stages of swapping an L32....it sounds like a good idea to me, and yes...your heads, manifolds, etc will bolt right up.

[JohnnyC]

Re: Max boost for an L32 from a supercharger

Sweet deal. I'm mating the whole shabang to a G-force T5 and once I break my 10-bolt, maybe a stronger rebuilt 10-bolt with better axles to avoid the added weight of the 12-bolt casing and whatnot. I'd better research cams for a balance between high-RPMs and streetability. I'd really like to get 7500 RPM, which would take some heavy springs and lighter pushrods and roller rockers to avoid vavle float im assuming. Anyone know how many RPMs the L32 rotating assembly can take? Also will I hit a ceiling when editing the rev limiter in the ecu?

[UDLOSE98]

Re: Max boost for an L32 from a supercharger

you would need a full new valve train to handle 7500, thats a bit high, IMO

[UDLOSE98]

Re: Max boost for an L32 from a supercharger

this is a great cam right here.... http://www.stattama.com/index.cfm?fu...242&product=53

[JohnnyC]

Re: Max boost for an L32 from a supercharger

My main concern is actually the computer, whether or not I can set the rev limit that high. maybe 7k is more doable. I wonder if Manley stainless valves ould be too heavy for a 7000-7500rpm application?

[JohnnyC]

Re: Max boost for an L32 from a supercharger

sick cam, thanks alot for the link. I'm going to check that out. I wonder how big of a roller rocker I can use with that cam without anything hitting... Guess it's time for some more homework :)

[UDLOSE98]

Re: Max boost for an L32 from a supercharger

you will need HP tuners to adjust your shift points, and yes they can easily go up to 7,000.

SI valves will accomidate higher shift points, but the main thing is teh valve springs, 130# is what you will want.

[JohnnyC]

Re: Max boost for an L32 from a supercharger

Excellent. I hope this thing will be fast haha. Hoping to see it roll out by summer '06 completed with all bodywork as well. One thing though, shift points are where the computer tells the trans. when to shift. That wouldn't really be a problem with the T5 :) But I'm sure if HPtuners can do that I shouldn't have a problem with the rev limit... only reason I brought the rev limit up is because somewhere a long time ago searching tehse threads I read that the max you can go is 6,800 rpm? Not sure if thats true as I have yet to buy my hptuners and play around with it


forgot to mention the t5 will be a gforce kit, rated at 500 foot pounds torque, not my junkyard t5 which i bought for $350 with 35k. i already broke my stocker haha.

And about SI valves, are they as strong as manley's valves? I heard from the shop who is doing my heads to avoid SI as they tend to break easily. titanium valves maybe? pricey i bet

[UDLOSE98]

Re: Max boost for an L32 from a supercharger

SI valves will do the trick, i dont know about manley....

Sorry, missed the T5 part, and yes HPtuners will knock out the rev limiter.

[SilverRS96]

Re: Max boost for an L32 from a supercharger

try breakin 2 stock trannies with no power adders...ya welcome to my world...im lookin into the gforce trannies...which 1 did u go with and how much did it end up costin u?

[Highhp]

Re: Max boost for an L32 from a supercharger

All we run is Manley valves without issue. There have been several cases of the SI valve breaking.

[JohnnyC]

Re: Max boost for an L32 from a supercharger

Sweet deal, I could theoretically build a 14000RPM motor with $50,000 and have the first F1-sounding v6 camaro, well sort of, but half the cylinders. I suppose I would have a hell of a car there lol. Maybe with 300# springs, some super light rockers, billet pushrods and some valves made of a malleable material with the hardness of diamond? lol

ahh ive been quoted around 2200 for a full build including upgraded mainshafts, gears as follows... 2.94, 1.94, 1.34, 1.00, 0.59. well i could be a little off with the ratios since i got that quote nearly a year ago, im not getting the tranny for a while yet, not until the motor is built anyway, and during the break in period i wont be romping it anyway so the tremec t5 i threw in from an 02 camaro should be okay.

Yeah, the guy Lloyd from Big al's toybox (the shop who is doing my heads) advised me to stay with manley valves, the "best valves money can buy" according to him and his years of experience with heads, but nevertheless the skeptic I am I am looking into possible lighter alternatives... anyone heard or know about titanium valves for our 3800s?