Just to recap a little for those who don't know me. I've owned my 1987 Camaro IROC-Z with the 305 HO TPI, Borg Warner T-5 and 10-bolt 1LE differential for about 5-6 years. I run a tire, service, performance store and we have on and off played with the car to see what we can do to maximize the car as a bolt on only project. I had no sucess with the differential and modified the internals as well as created a few parts to strengthen the smaller axle shaft tubes to make a pretty darn bullet proof differential without moving to a 12 bolt or the Ford nine inch conversion (not to fond of putting Ford into Chevy or Chevy into Ford). But that's another thread all together!!!

So the biggest part of maximizing the car was Horse Power of course. Started off a couple years ago with a direct port nitrous injection system with a progressive controller and that was a lot of fun! After a lot of testing (lolo) decided to pull that in favor of a Procharger D2R system but found along the way the ATI has sort of crappy support, so we pulled the Procharger of and moved to a Vortech V7Ysi and that seem to be the best fit! Vortech was very helpful over the last year and a half with helping come up with brackets and a 10 rib pulley combonations that works very well! The biggest part of the challenge was fuel delivery! With the NOS system it was easy, just put bigger jets, with a supercharger it's all about EFI! Keep in mind I'm still using the OE MAF system and customized a 3.5 MAF housing last year to stay with the factory ECM.

If anybody has been reading my post about the stand alone FIC system I just fabricated up, they know there has been some issues on using this to suppliment my fuel deficiency epedimic. So did it anyway and just on the test drive it seemed to work pretty darn good, but the Dyno is the heartbreaker so we called in a appointment for this Saturday and off we went. I only had the dyno reserved for 1 hour and think with a little more time and tuning we could probably grab another 25-35 hp but after 9 full pulls here are the results and you be the judge.....

Keep in mind this is a stock cast internal, stock cast iron head motor.

459.13 HP and 479.22 TORQUE at 5500 rpm and 11 psi boost

For further info, feel free to post up or pm me. I tried to keep it basic, not everybody on forums are super techies or know tons of fancy achronyms and engineering techno mumbo jumbo. LATER GUYS

PS- NOW COME THE PURPOSE BUILT MOTOR CAUSE THE BOLT ON PROJECT IS OVER!!!! HOPING FOR 650+ YEE-HAA!

 

Nice work! Have any pics of your setup? Also, have you modified the T5 at all to hold up to the extra hp?

 

What exactly did you do to the rear end?

Is that intercooled, on pump gas? 91 octane?

 

There are pictures on my Car Domain account and as for the T5, it was just "gone through" real good and I use race synthetic ATF to keep it alive.
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Six core Spearco intercooler, on a 50/50 mix of 93 octane w/ Torco 110.

 

so you pulled those #'s with a stock 305 and 11lbs of boost?

 

Good question. I wonder what intercooling system he's running as well.

 

Yes, I pulled those numbers with a stock all cast internal, cast iron head 305 HO motor. The intercooler is a 6-core Spearco. Check out the picture on Car Domain under 1987 Camaro. I think there is a little left in the tune, but I'm satisfied with that number enough to move to the purpose built 305.

 

i'm not saying i dont believe you, but could you post the dyno graph?

my 305 is far from stock and with my procharger and 3 core intercooler 11lbs of boost made 381hp and 400 ft/lbs, i know theres more in it with tuning.

oh and you put slicks or drag radials on that 10 bolt and it'll be done in no time, ask me how i know.

 

http://www.cardomain.com/ride/2496232

I stumbled on his cardomain and it has the dyno graph. I'm really impressed with the numbers too, unless he has a 350 and doesn't know it.

 

Since the post doesn't say flywheel or rearwheel HP, I am going to assume FWHP if that truly is a stock 305, stock TPI, and stock TPI cam. At that rate it seems possible if the IATs were dropped into the 80* F range.

That is the great thing about an engine dyno and reported HP. You can test an engine at the extremes where it is never really run in the real world and report big numbers. Rear wheel dyno machines also have the benefit of the reported flywheel fudge factor. Not trying to pick on the setup, just more info needs to be posted to make the HP make any sense. It appears to be a rearwheel dyno number with a fudge factor on it to make it flywheel HP. If that is a rearwheel HP value then either the dyno is broken or someone played with things inside that 305ci.

The real interestering number would by seeing the before boost HP value and after boost HP value.

 

Run the car from time to time with a couple different f-body clubs at he local drap strip on a set of Mickey Thompson ET Streets 26x11.50-17s and the differential is holding like a champ unlike the two prior to the mods. I'll post pictures and and mods on the modification thread this weekend.

The dyno sheet is posted as of yesterday on my Car Domain sight.
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It is a 305. I know what motor I have in my car. I'm the General Manager of a 51 chain Tire and Auto Corporation and over see the Performance side of the house. I've owned my own performance business before going to work with present company for seven years. I assure you I'm qualified enough to know what displacement motor I have....

 

OK, for all the sceptics, here is the site for the Dynojet facility the car was tuned and tested at: http://www.waynesdyno.net/page1new.html It has taken 3 trips to the dyno and a year plus to get to that number with tuning and fuel changes. It is real RWHP and the facility has as of this year upgraded the dyno for up to 1500hp pulls with all the new software upgrades and calibration verifications.

I would be happy to submit to a tear down challenge for the right $$$, or contact any of the local car clubs to validate the claims. It is truly an all cast crank, cast piston, cast iron head 305 HO engine. Crap, I didn't even port match the heads...

http://www.greenvillefbody.com/ http://www.ncoutlaws.com/forums/index.php
http://www.performancefreaks.com/portal.php

Thanks

 

I am skeptical about everything so please don't take it the wrong way. Details usually explain everything. I can see it making that RWHP with a stock 305ci long block and a stick trans. I never doubted that. I have a hard time believing it can do it with a stock cam and intake. That is a nice IC so you are getting a great FWHP increase there with the cold IATs.

What cam is in that thing? If it is a stock 305ci camshaft, then what year engine did it come from? Honestly, I think it is all about the cam....and that is why it makes 450+ RWHP at 5500 RPM.

EDIT: If that is a stock cam then I would think that you at least have 1.6 rockers on it. What was the IAT temp at 11PSI? To get that HP I figure about 50-60*F. Was it a cold day or did the IC get iced? It seems like there is something missing here that you forgot to post.

What was the 1/4 times you mentioned you ran and car weight? Those are real world HP figures.

 

those are some insane numbers for a stock internal 305, and stock heads kinda hard to believe, but who knows

 

Good questions, the cam is a Crane cam p/n 104224, Duration 270/ 276, Lift .452/ .465, the intake consists of a Holley twin 58mm throttle body, to the stock intermediate (ported) to SLP runners (ported) to a mildly port OE base. The cast iron heads are entirely unmolested (no 1.6:1 rockers), as is the short block. The temp that day was aproximately 60*F, but the large six core sheet metal intercooler is a plus! Strange thing was that the car pulled stronger without icing the cooler as the car is equiped with a DEI Cryo kit. Suspect that the CO2 is making it's way into the inlet path.

Car weight is fat, aprox 3700-3800lbs and as for the quarter mile time, have not run the car at the drag stip since getting my fuel situation corrected, but before when the car ran out of fuel, went 12.85 at 121 shifting at 4500-4800rpm. Hope to get back to the track eventually, but setting the car up for Time Attack next year.

 

i'm using the same cam with s/r torquer heads full exhaust, ported intake setup by accel and a holley 52mm tb.

 

Must say the car looks great and killer HP to boot!

Just want to point out something, looks like you peak HP comes in at 5100RPM, how much boost you getting at that RPM?

Another note I take it that piping from the blower is 3 1/2 all the way through, wonder if that does help things with that big blower.

 

hey zdaddy i was wondering about the custom maf sensor work you did to your car i would really like to not go blow $300 on an aftermarket maf if i can get around it can you point me in the right direction? thanks

 

I just put a new thread on the drivetrain side, check it out!

Thanks

 

Wasn't that hard, just took a 3.5 inch piece of tubing and welded a flange. Tapped four holes to accomidate the electronics side of the OE MAF and bolted it in, wa-la, high flow MAF sensor housing! Just be very careful when disassembling and reassembling the components. You will have to cut the four lead leading to the sensor wire housing and resauder them.