So even though I have HPTuners, I bit the bullet and had Jeremy Formato tune the car last weekend. I was happy with my OLSD part-throttle and idle, but didn't feel I was getting everything I could out of WOT.

We're working through some random high idle problems, but the car typically picked up 5-15rwtq across the board over the fueling and spark maps I had from street tuning. The ambient was hovering around 98-102* during dyno tuning.

But long story short, I'm still disappointed in the results overall. With 11.4 compression, PRC 58cc 5.3L heads, 224/230 XFI cam, longtube headers and Vengeance Ported Fast92 I was really expecting to be closer to 450-460rwhp and maybe 10rwtq higher at peak torque based upon other posts with similar combinations,

Is it worth my while to worry about this? If so, where do I start without big expenses?

 

1. Can't compare two dynos.
2. You have 5.3 heads. They give nice compression but don't flow as well as 243s. Those are most likely holding you back.
3. Your cam is mild.

I think your dyno is pretty close to where it should be.

 

^^^^ I think that is pretty much it. But what other mods do you have??? Maybe add a pulley, ram air, cutout???

 

Click on the link in my sig, and click the Modifications tab at the bottom of the new window. Yes, I have an ASP pulley, FTRA and cutout. But the FTRA doesn't help on the dyno.

 

PRC 58cc 5.3L heads, 224/230 XFI cam

Found your problem.

Get better heads and a slightly more aggressive cam if you plan on 450whp.

 

Numbers look good for an LS1. Dont fret, I'm sure it will run well at the track, you should be able to pull off some good times. Your cam really isn't that small, you have good lift as well which a lot of people neglect that. I know the 5.3l heads dont flow as well as the 243s, so you could have room for some pick up there, but your making pretty good numbers as is. I wouldn't worry about it.

 

Yep....

 

Crap. Guess I need to save for the next upgrade.

 

you have budget oriented heads and a cam with an intake duration of 224 and you expect 450-460?

that is not the norm. formato is the best and you are in good hands. if you want more power, you need a set of TF heads and a bigger cam.

 

When I had a 227/235 LSK cam, it made basically the same numbers with an LS6 intake. I was using a rev-kit & Caddy lifters with the LS6 vs. the OEM lifter trays & LS7 lifters now with the Vengeance Fast92. I was hoping the ported Fast92 would more than offset the change in cams. I would prefer AFR's to TFs, though :-)

 

I have to agree with changing heads. 450 is achievable with 224/230, even beyond that. Look for Tony Mamo AFR 205, 224/228 114LSA combo, 475 rwhp in a C5.
Attention to detail and hours of tuning can get you there.
So TFS 215 or AFR 205s can do it.

 

Most people over look this.

 

Also, Mammo had an EWP. As many have said though >450 is not the norm with that cam. I think to get where you want you are a couple mods away, agree with above.

 

+1....

 

A mid 230 duration cam with low 600's lift and aftermarket casting will get you over 450 with a ported fast 92/92. You are making 11 second numbers right there, I'd be happy for a good while. If this isn't enough for you the cheapest least time consuming easiest way to more power is a N20 jetting away...that is after you buy the nitrous kit...

 

well, though i agree with the above, here is my experience.
i have the same heads, 59cc, and my scr is ~11.8:1, ported ls6 intake, p/p tb, but, my cam is 236/240, .600+ lift int/exh.
almost straight from the install, it dyno'd, iirc, 430rwhp/400rwtq.
i have spent many hours tuning it, and, it is a lot stronger than that dyno day.
so, if it is not in the 450-460 area, it is close. oh, it is a GTO. (we dyno less than fbodies)

anyhow, hope this helps, and it does reiterate the cam upgrade. just my experience, for better or for worse.

 

I checked with Tony and those awesome modifed AFR205's run $3500. For $3500, it better get me there without a new cam N2O not legal for my type of racing.

Your signature says you have a 418ci... can I assume the numbers above were on the LS1 longblock you are selling?

 

that is correct.
i am actually installing the forged 418 in a couple of weeks.

 

Definitely on the low side. The cam only cars I do are typically in the 410-420rwhp area with stock 241 castings and LS6 intakes.

As stated, you have budget heads and a relatively small cam. TQ curve looks good though.

Don't spend another $2000+ on heads. Just throw a $400 NX kit on it and hose the bitch with a 100 shot.

 

I agree!