I would like to know if that is possible safely without an intercooler... I am planning to run 9psi... I am doing right now 392 with lack of fuel and a crappy cam... Cam was changed already and 9 psi is next...

I would love to get to 500rwhp without the need of an aftercooler.

Is it possible or most likely or impossible?

THanks

 

500rwhp without an after/inter cooler is easily attainable. (IMO just not possible with your current compressor)

 

Well, if your not goin to use an after cooler are goin to at least run some kind of cooling agent like a water/alky injection or n20?.

 

My car right now is running 18+ psi of non-intercooled boost, according to the dyno guys, at around 6000rpm, and once we get the fuel problems solved, it should go till around 6700 rpm. We are also putting on a larger pulley to bring the boost down to around 13 psi so we don't have to remove nearly as much timing, and it should still yeild the same hp results as the 18 psi with a bunch of timing removed. Once everything is sorted out, we expect it to make in the neighborhood of 480-500rwhp. This is done with a t-trim and no cooling method of any kind. Obviously cooling of some sort would be very beneficial in my case, and I am looking into it, but this is how I bought the car. My point in all of this is that with a proper tune, the proper engine components, and running high octane pump gas, you can obtain 500rwhp without an intercooler. btw, my engine is a 355 with forged internals, a custom ground 'blower' cam, and a few other goodies.

 

i've been tossing around the idea of single turbo or a 9# vortech s trim no inter/after cooler, some bolt up stage 1 heads real wild blower cam plus boltons. could i see 500rwhp with that setup? thanks



doug

 

Well.. no.. I got 447 yesterday...

I did some major mods like changing to an S-trim, fuel pump, bigger injectors, LTs!!! and a better cam...

All I gained was 50rwhp bumping from 393 to 447

 

F-bud: what (exactly) was changed? That would help in figuring out if that's a reasonable hp gain or not. In terms of analyzing what is going on and if that's really what your combo is capable of, that's tough to do without a lot more data. But just a shot in the dark: it is very common with an LT1 is to have the computer pulling huge amounts of timing. I finally disabled the knock sensor on mine after being unable to deal with the false knock. It was pulling 10-12 degrees of timing and I was losing ~50rwhp as a result.

Rich Krause

 

Ok... here it goes

I changed the supercharger.. from the paxton sn93 to the vortech s-trim

I am seeing the same IATs at 9psi than at 4.5 the other time.

I changed from the shorties 1 5/8 to the 1 3/4 2300º ceramic coated hooker and a nice y-pipe...

I did the upgrade to a 255lph in tank pump GSS340 with the racetronix harness...

and I did change from teh 215/220 533"/544" CAM TO

224/236 114 lsa XE 3300 series

I was running total advance as seen on the logger with 36 and retarding 2º/boost... If I go down on the retard I will get some spark retard at around 4krpm and no more spark retard after that...

I dont get it though... but maybe my problem is timing...

I was hoping to reach the 500rwhp mark with it and I am a bit dissapointed to get only 450.

 

Street renegade cars make over 800rwhp with no intercooler so yes it is possible, even with 310cid

 

Don't get me wrong, I am not saying it's is safe to run more timing (and I am also not saying it's not) but you do not have enough timing. You are running 18 degrees of timing. Somewhere around 30-32 should be optimal and I bet you would see another 40-50rwhp with that degree of timing. Put in some race gas and try it.

Rich Krause

 

I used to run 36º with my previous setup... I dont see a way of doing so now... I wish I could run 32!!! As a matter of fact.. My current goal is 25.

I mean.. with 9psi and 9:1 CR I think it is attainable.... So.. Why am I getting knock if I turn it up a bit???

I do think my valvetrain is a bit noisy but I do have the lt4km....

Dont get it

Check this run that I did today:

http://netdial.caribe.net/~highland/32deg.uni

or

http://netdial.caribe.net/~highland/32deg.zip

if you can check them out let me know


That tune seems lean but on the dyno I was getting 12.6 afr... and in that tune its showing 880mv more or less...

Let me know what I could do.. I will start by going even more conservative on the timing to TURN DOWN the msd dial and build up from there till I get 0 knock...

I have some race gas which I will try soon and go to the dyno again...

 

If it's not too lean, with 9:1, your cam, and race gas you can run 30+ degrees with no problem. Put the race gas in and adjust the AF ratio to ~low 12's:1 range. Turn off the boost retard function and disable the knock sensor (in software). Start at 20 degrees and move up to 24 degrees. If it makes more hp go to 28, then advance by 2 degrees per run until the hp increase flattens off.

Back off a few degrees from where you get max hp with race gas then do a run with the KS activated and the fuel you will run on the street. That should put you in the ball park.

Rich Krause

 

Perfect.. that way I can determine if it is true or false knock.. this is the first time I encounter this sort of problem.. actually the knock on that run, if you saw it, wasn't there yesterday...

But the other question is... I should be running 30+ timing.. ok.. but... with 200F IATs?????? My idle IATs in a point where as high as 160... Something was not right... The other thing is.. I am seeing the same psi but on the scanner I am not seeing the same AFGS from the maf.. I maxed out my maf quite a few times and now I am not able to do that.. maybe I have a leak on my intake side of the supercharger that is making my car leaner...

Hmmm... After writing it.. I thought it, and I think it could be a possibility on why my blms are way lean now and not as lean yesterday... got to check...

 

burger made 540 rwhp w/ a 10 lb non intercooled s trim on the 355 that is going in my TA (along with another s trim).. so it can be done without a ton of boost too.

 

Do you have a way of knowing his IATs???

Let me know

Thanks