Blacker2000SS

Well, truthfully I am not really that thrilled with my dyno results, but the operator was pretty tickled with them. He always has problems with MSD setup messing with the tach readings, and he can usually hook up his photo tach to correct it. Well, he got the photo tach to work, but for whatever reason, under WOT, the tach would not work. The tach is needed to get accurate TQ numbers, so I'll have to wait until next time for those. Horsepower was fair at 334 at 5700. The car is rich across the board, but it turns out we did not have the drill bits small enough to drill out the air bleeds, so that will happen next time(in a couple weeks). He figures getting the air fuel right on will net me about very low 340s. The most disturbing thing was that power was falling off at 5750 already. With the XR-294 this should not be happening. We both agreed that this motor is a perfect candidate for an AFR Hydra Rev. The motor lost over 30 HP from 5800 to 7200. Noteworthy is that the operator was
very impressed with the runs, and said that next to nothing N/A runs over 300 to the wheels on his dyno. He has dyno'ed tons of LS1 cars, and typical 6 speeds are running about 300 to the wheels, and higher mileage ones have ran as much as 305. A modified LS1 with headers and T.B, and a bunch of other
stuff ran 327, I saw the chart on that one, and the operator said the guy was pretty smoked about it. Well, thats about it, so assuming a 20% drivetrain loss(which he confirmed, he said 13 to 15 for manuals, and 18 to 22 on autos) my motor has about 400 FWHP. Not overly impressive in my book compared to what I was hoping for(and promised), but its a starting point. If anyone would be interested, I can have the dyno slips scanned. I'll keep you all updated.


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Well, how times change. The 79 now features a long rod, roller 355 with the new Edelbrock E-Tec 200 heads. I'll have times and dyno tests this summer.[URL=http://www.monte-list.nu/html/images/jeremy_polar/]

AutoRoc

Interesting! I have those exact heads sitting here in my basement. Those will be put on a 383 with a Comp Nitrous HP Cam. 230/244 duration .530 lift. With a Ramjet intake, 36lb injectors, Gen 7 DFI, possibly a Rev-Kit, and 1-3/4" headers..4" exhaust. I'm definately looking for a little more than you found. I was thinking along the lines of 350-375 at the tires through a 700-R4 trans. Power will hopefully peak around 6000-6200 rpm. Wish me luck but god knows it won't be together for a while.

FWIW, I'm looking to spray it with a worthwhile dose also. Thanks again for the info!!

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Denny Villemure
1989 Camaro IROC-Z Convertible, 305 TPI, 2.73 Gear, Flowmaster 2 chamber. 15.60 on motor, 14.20 on a 75 shot from NX. Woo hoo!
www.denny.cz28.com

RedIrocZ-28

What is your setup?

Blacker2000SS

Your welcome for the info!

My combo goes as follows:
89 355
Edelbrock E-Tec 200 heads
1.5 Crane Golds
Edelbrock RPM air gap vortec intake
Mighty Demon 750
Comp XR294-HR roller cam
SRP forged pistons
Eagle 6 inch rods
Eagle crank
Motor is 10.3 to 1
Full MSD ignition
1 3/4 inch headers
2.5 mandrel true duals with 3 chamber flowmasters
TH-350 with B&M 3600 stall <--- Total crap, still not locked up at 7200 RPM.
3.73 Posi rear.

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Well, how times change. The 79 now features a long rod, roller 355 with the new Edelbrock E-Tec 200 heads.
Best dyno of 334 @ 5700 so far......

[This message has been edited by Blacker2000SS (edited August 25, 2002).]

Perry93TransAm

Valvetrain control could be holding you back as you already know, But you should be making real good power past 5700 with your set-up, did you get your heads flowed before? I was wondering how these heads would flow.
Perry

RedIrocZ-28

I just ran a similar setup through Desktop Dyno 2000 and came up with similar numbers. It was basically my setup with better heads. I got a max of 340 HP and like 355 TQ. I was using headflow numbers of 278 IN and 195 EXH @ .500 lift also using 2.02/1.60 valves. The cam I used was my cam with .495/.502 218*/224* 110* LSA. Made decent power up to 5500 but then dropped off. Other than these parts I basically have your motor. My TPI probably flows roughly what your Carb intake does.

Keep your head up, tuning is what will get you to your goals. If not, go bigger!

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-Brad C?
355ci '89 Iroc-Z Red, T-tops, power everything, A4,New 10 bolt w/ 3.73's
Trans-Go shift kit Corvette Servo,Accel 8.8mm wires,Flowmaster 80 series ,K&N's, !MAF Screens, Hollowed out airboxes,homemade Subframes. Kieth Black pistons 10.3:1, Comp Cams 270H (.495/.502 218*/224* 110*LSA) & valve springs, SLP 1 3/4" headers, TCI 2400 stall, Dual Roller timing chain, 2 3/4" I-pipe.
Full street trim best run:14.799/mph:93/60': 2.02 (last year) New Times to come.
New times: 13.732 @ 99.30 on a 1.878 60'
Pics of the Iroc

Chuck!

Edit, found it Im a freakin detective

http://www.compcams.com/information/...4HR-10_001.asp

Comp got 420 flywheel hp with that cam on a 350 with the Sportman II heads, which shouldnt be a ton better than yours, and a victor Jr, which is prolly where some of the extra power came from. Id be happy with the results, 400 hp is 400 hp

[This message has been edited by Chuck! (edited August 26, 2002).]

AutoRoc

Yes, you are losing massive power up top for some reason. That cam should make peak power AT 6500 RPM. Meaning a shiftpoint of over 7K could be done! Rev kit it man!!

Edelbrock's site has the E-tec 200 flow numbers. Supposedly they peak at 265 intake and like 205 exhaust. I don't trust numbers from manafacturers so I'll flow mine at a local shop soon just to see what they really do.

BTW, I am using the exact same bottom end pieces! It doesn't break the bank TOO bad and it's all proven high HP stuff! Goodluck on more power.

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Denny Villemure
1989 Camaro IROC-Z Convertible, 305 TPI, 2.73 Gear, Flowmaster 2 chamber. 15.60 on motor, 14.20 on a 75 shot from NX. Woo hoo!
www.denny.cz28.com

Blacker2000SS

Thanks for the kind words guys. I did not have the heads flowed, but we'll see what I can come up with for power this year yet. Maybe these heads will end up going under the knife A while back a guy sent a reply to me from a message board that was extremely helpful, also look at his E-Tec 200 heads he had reworked. They seem to flow OK
His heads after porting:
INT. EXH
.050 39.4 15.9
.100 68.3 49.3
.150 106.1 76.7
.200 137.9 113.3
.250 170.7 147.5
.300 197.0 164.4
.350 220.3 191.6
.400 241.3 219.1
.450 253.1 237.9
.500 264.4 242.4
.550 271.0 271.6
.600 282.6 264.9
I spoke to Comp Cams today about my power falloff at 5700, and the guy said I need bigger valve springs, and gave me part number 987-16. Do you guys think I should leave my valve springs alone and just get a Hyrda Rev, or get new springs? Or both? Things like this are touchy, and pricey, so opinions are greatly appreciated. Thank you for taking the time to read my drama


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Well, how times change. The 79 now features a long rod, roller 355 with the new Edelbrock E-Tec 200 heads.
Best dyno of 334 at 5700 so far.......

AutoRoc

Bigger/stronger springs with lightweight titanium retainers would be cool and would help with rpm control

So would the rev kit

Since the rev kit is cheaper, i would probably try that first.


Edelbrock advertizes the E-Tec 200 heads to be suited for 1500-6500 RPM powerbands. They should have stepped up the springs damnit!!

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Denny Villemure
1989 Camaro IROC-Z Convertible, 305 TPI, 2.73 Gear, Flowmaster 2 chamber. 15.60 on motor, 14.20 on a 75 shot from NX. Woo hoo!
www.denny.cz28.com

AutoRoc

And that guy getting 270+cfm out of the exhaust is crazy. That's equal to the intake flow! I wonder how much work he had to do to get those numbers. It's either bull**** information or it's a lot of money!! hahaha

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Denny Villemure
1989 Camaro IROC-Z Convertible, 305 TPI, 2.73 Gear, Flowmaster 2 chamber. 15.60 on motor, 14.20 on a 75 shot from NX. Woo hoo!
www.denny.cz28.com

Ray86IROC

The springs are way overpowered with that cam, I'd change them first. The hydra-rev kit won't do jack **** for problems at 5700rpm IMO... Might need them once you start making power well on up into the mid 6000s though, but first things first the springs have got to go...

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Ray87Z on newer boards
-Vortec headed 350
86 IROC (retired to brother)
-cammed 305 TPI in the IROC.
http://www.inter-scape.com/Ray

[This message has been edited by Ray86IROC (edited August 27, 2002).]

Blacker2000SS

I guess I will go the valve spring route first. Thank you for all the opinions. That guy with the big flowing heads, those are not B.S numbers. He had a company in Bowling Green, Kentucky do the work, and it costed him $700.00. He owns a shop, and has a pretty wicked fuel injected 87 Monte Carlo SS. He's using a Ram Jet intake that he also had ported and matched to his E-Tecs.

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Well, how times change. The 79 now features a long rod, roller 355 with the new Edelbrock E-Tec 200 heads.
Best dyno of 334 at 5700 so far.......