Random Ls question

[UNGN]

Actually on a 4t65 you wouldn't want engine at the rpms to fully spool. Would scatter the trans all over the track lol

That is the turbo motor's "low end torque" scattering the trans. Superchargers generally don't make 22 psi of boost @ 2500 RPM. My car could when it was basically stock.

Newer Turbo cars like a BMW 335 or an 3.5 ecoboost spool at 1500 rpm and make max torque right off idle. Manufactures use superchargers to meet cold start emissions regulations and have 50 state legal cars, not to go faster.

 

[L67ss]

Boost levels dont always equal HP ....my last motor made between 14-16 psi yet would have been stomped by my current motor making 10 psi.....both before 2000

 

[UNGN]

Boost levels dont always equal HP ....my last motor made between 14-16 psi yet would have been stomped by my current motor making 10 psi.....both before 2000

That is true, in different motors, but in the same motor, 22 psi is going to make more HP than 14-16 psi if it has the fuel to support it, especially if it makes 22 psi from 2500 RPM to 5200 RPM as the area under the curve is way more.

The Stock D5 convertor in a TR stalls at about 2400 RPM. The stock turbo spools at 2200 RPM. Stomp the gas and and it leaves the line at to 7-10 PSI and is at 22 psi in just a fraction of a second. Near stock TR's are deadly in a Pro tree race: Stage, give it a little boost, Flash. stomp, go.

Stock turbo, stock injector, stock intercooler, 100% untouched stock longblock, stock trans, stock gear full weight TR's can run 11.9@112 with a chip, K&N, fuel pump, race gas and traction. I went 12.2's@110 in mine with a lot still on the table (slick track, 1.8 60 foot and tires that were 2" too short).

If 3.8L's TR's were supercharged, maybe they could have dipped into mid 13's near stock? maybe?

 

[L67ss]

Stock long block 3800 s2s dip into 13s on a regular basis....on pump gas. The main hinderence in et times is the crap 4t65 and traction issues. And that's on street tires and no intercooler period. Personally that was one area gm dropped the ball on the series 2 was in that there was no factory ic....not even available through gmpp.

 

[UNGN]

Stock long block 3800 s2s dip into 13s on a regular basis....on pump gas. The main hinderence in et times is the crap 4t65 and traction issues. And that's on street tires and no intercooler period. Personally that was one area gm dropped the ball on the series 2 was in that there was no factory ic....not even available through gmpp.

If TR's had 3800's they would have run mid 10's with 100% stock long blocks, with injector and larger turbo swaps. The 3800's are way ahead of 3.8L in terms of head flow and motor strength. A 3.8L head flows 150 CFM on the intake/110 CFM on the exhaust - absolute crap. A 3800 head flows 190 CFM on the intake and 150 CFM on the exhaust untouched. GM would have had to put 36lb injectors on them from the factory (instead of the stock 28lb) so a tuned, stock GN would have been a mid 11 second car, if it had a 3800 instead of a 3.8L. On 93 Pump gas, probably mid 12's @ 109, tuned stock.

 

[motorheadmike]

The 3800's are way ahead of 3.8L in terms of head flow and motor strength. A 3.8L head flows 150 CFM on the intake/110 CFM on the exhaust - absolute crap.

Buick guys hate hearing about the faults of the stock engine.

 

[UNGN]

Buick guys hate hearing about the faults of the stock engine.

My car ran 11.53@118 and I wanted to run high 10's stock appearing so I tore the motor down to pocket port the heads. When I got the heads off, I couldn't believe the car had gone 12's let alone mid 11's. The heads were full of ridges of casting flash and mismatch and the port shapes were 1960's. awful.

I also have a TTA so I figured while I was porting stuff, I buy a set of those heads to pocket port and put big valves in. Someone on TB.com was selling NOS TTA head sets for like $200 shipped, so I bought a pair. Those heads (basically FWD 3.8L heads) are WAY better. They were designed by someone who kind of knew what they were doing and cast by someone who gave a crap.

Only 3 years was a huge leap and 3800 is way beyond that.

 

[L67ss]

There's been a few guys that did turbo 3800 swaps on legit grand nationals. I got bored with the pages and left them before I heard ets

 

[L67ss]

Too bad s2 and s3 heads don't fit

 

[86pontiac2+2]

Superchargers hate barometric pressures. Turbo chargers could care less. 'Nuff said.