New best times for the 3500 Lumina!

[Superdave]

OP, what injectors and FPR are you using with that stock 3.1 chip?

[1QUICKHATCH]

OP, what injectors and FPR are you using with that stock 3.1 chip?

95 3.4 DOHC injectors and a 2000+ FPR


here is a run down of the rest of the setup:

bottom end end is stock
3400 Head gaskets (what I had around at the time)
ported heads -more than a little, less than a lot
mild ported LIM -just at the bottom of runners, going to do a better one soon!
3400 plenum -ported with LX5 65mm TB
ported rear exhaust manifold -hope to replace with headers soon or at least 3500 manifolds
Full 2.5" exhaust from manifold to tail pipe.

would the 3500 plenum make much of a differance? And what factory injectors dose every one recomend? l67 with a '99 and older FPR?

[Superdave]

I'd use stock 3400 injectors and the 00+ FPR. the spray pattern works well with the runner design of these engines.

the 3.4 DOHC injectors have a very foggy and wide spray pattern that's not well suited for the gen 3 engines.


you should use a properly ported 3500 plenum and then port that LIM out to the metal 3500 gaskets on the top side.. but first, get a chip. you're seriously losing 40-50 HP by not having it tuned right.

[3400-95-Modified]

then port that LIM out to the metal 3500 gaskets on the top side..

Glad to hear someone say that, I did this on mine and I was wondering if I went too far.

[SappySE107]

Glad to hear someone say that, I did this on mine and I was wondering if I went too far.

I am not entirely sold on this idea yet for NA. Why don't you gasket match the lower part to the metal 3400 gaskets? Other people do. Not solid reasoning IMO.

[3400-95-Modified]

I gasket matched my setup straight through, My uppers to the 3500 metal gaskets and the lowers to the stock 3500 gaskets since the metal felpro's did not exist when I did my porting. I found out that the metal 3500 Felpro gaskets are now smaller than stock and overlap my ports so I had to stick with the 3500 stock GM lowers.

If I had another 3500 lower intake I'd probably try to do a dyno run on both to see if there are any ill effects from porting it that way but I haven't picked up another 3500 top end yet. I do plan to sometime.

Why don't you gasket match the lower part to the metal 3400 gaskets? Other people do. Not solid reasoning IMO.

I did what I wanted to do with my car and I started by doing gasket matching/port alignment, (I matched to what gaskets were avilable at the time) and then did some more port work in 2009 through the rest of the runners simply casting smoothing, no major material removed in any areas. I was happy to see what Dave posted because he has been very successful with his setup, Everyone has their own ways to port and I know you use a lot of flow bench data to determine what your doing and I don't have any disagreements with that, but it's just nice to hear someone else who's been successful doing the same thing. I'm not trying to say any which way is better.

[Superdave]

Considering the LIM and UIM are restrictions on these engines, gaining whatever possible through them seems logical.

[SappySE107]

Logical? I don't think so. I feel like I need to prove myself more than talk.

[Superdave]

Hurry up and 3500 swap that wagon,

[robert 1980]

Port work proof is next weekend=0 Jon says 210 maybe,but im hoping for 220ish.But jon knows better then me.

[3400-95-Modified]

We don't have a base line to compare though Robert... if we had a stock engine and ran those 3500 parts with that cam, and then put the ported stuff on then yeah we would be able to see the gains, but you went from a stock 3400 to a 3500 hybrid and cam, and also never had a 3400 dyno graph, so this is really just for tuning purposes and to get a baseline number. As many say dyno's don't tell all since they could be calibrated slightly different than another.

[robert 1980]

Well i figured if geoff's car made 185whp.And the best i've run 1/4 was a 14.84 on street tires.I would be around 175-180whp.
So with the part i added. 30-40whp would be possible.Not trying to say i know what im talking about.I just wanted more.lol

[Superdave]

a stock (other than 10.8:1 SCR) 3500-5 speed that i did all the port work on put down 224WHP/235TQ.. that's about 250HP/260TQ @ the flywheel. Stock cam, 3400 log manifolds, 65mm TB.. This was on a dyno somewhere down south.

[robert 1980]

Well i have both upper,and lower competition ported intakes from WOT.And street/strip ported 3500 heads.The cam is .206 .206 duration .533 lift. 9.1 compression headers,and a cutout.225whp was my goal.But anything over 215 would make me very happy.

[1QUICKHATCH]

http://wot-tech.com/shop/gm-60v6/obd.../prod_271.html

The parts we use are there. We also use the ostrich with the BMWs but its not so easy with 1 person. Still a nice setup though to have.

just went to look at the links on that page again and they are not working... hopeing to get tuning this thing and get back to the track with in the next month!