Where is my 300RWHP Pull?

[90LX306]

Hey guys, i have not been around latly but i am now searching around again and started to notice i didnt make as mush power as i should have. About a month ago, my car made 294.77RWHP and 313.83 RWTQ on a DynoJet dyno. Considering last year my car had e-brock heads, TFS Street Intake,and a Comp XE274 cam it made 285 rw, i only gained around 10 rw this year. I seep headed combo's making about my power so im starting to think im loosing something somewhere. Here is my entire combo: 306 balanced, romac damper, Eagle i beams, JE/Srp pistons, AFR 185's w/spring upgrade, titanium retainers, TFS Stage 1 cam,Harland Sharp 1.6 rr, TFS Track heat intake w/1" spacer,24lb injectors, 75mm Pro-M, 70mm BBK tb, C&L Trueflow pipe, K&N Panle in stock box, Mac 1 3/4 LT into a Dr.Gas 2.5" X pipe, Flowmaster cat back, 155lph fuel pump.
The car was dyno'd without the air box and made no additional power. I know the 185's r overkill on my 306 but forced induction is in the future. I personally think i should have atleast 305-310 Rear wheel, can anyone think of something that might be holding my car back? Thanks in Advance guys.

 

[90LX306]

TTT anyone?

 

[mattfleming]

The key to any setup is the tune.. How does your fuel curve look on the dyno? A Tweecer may work wonders!!
Auto or 5sp? auto's lose a lot more power to rear wheels (meybe not that much.. but it could be a factor)

 

[QDRHRSE]

You have a lot of nice stuff. Unfortunately, your heads are a little big- but you know that. The big problem is the broomstick you're using for camshaft. Those heads deserve better. Your exhaust [headers] is murdering you as well. With a power adder and a cam you'll do great. BTW- auto or stick? Compression?

 

[mackey]

Well, you really didn't match your combo well. The AFR 185 and Track Heat are more suited for a bigger engine such as a built 347 or a 351W. And why did you spend all the money on those two when you have the TFS Stage 1???? You really should have spent more time selecting the cam.

 

[drgn5.0]

you could definitely use a hotter cam for those heads. try the 282hr comp, it matches them pretty well.

 

[90LX306]

Ok thank's for the replies...The TFS stage 1 is in there due to the fact i live in rhode island and am required to do emissions testing. I have sitting on the shelf in my gerage a Comp XE274 w/a 555/565 lift that i am debating on throwing back in.2nd, the track heat upper is there because last year the street upper's runners were a little too long so i swapped uppers w/someone else. The car is a stick (stock t-5 which is about to burst) and if i remember correctly it is a 9:5 compression ratio. Everyone i talked to said the 185's wouldnt hurt me that bad, and i dont need to go and buy heads 2-3 times just because i wanted to make crazy power while n/a. Again, the deal w/the cam was that i needed emissions friendly and i got my sticker, you guys think a hotter cam will really wake it up? Thanks again for the reply's. Also...A?F ratio was in between 12 and 13 .

 

[90LX306]

TTT anyone else?

 

[CRASH7772]

Don't know if this helps or dissapoints you but here it is.....

In MM&FF cylinder head shootout they dynoed a 306 with a Comp Cams XE264HR cam (.512 lift, a dual duration split of 212/218 at .50 ground on a 144-degree lobe seperation angle), Probe flat-top pistons, RPM air gap intake, AFR 165 heads (I can't find the combo they did with the AFR 185's) 34 degrees total timing and got 396HP@5800 and 342TQ@4700 at the flywheel. Average HP 288.89/TQ 353.86, Peak air flow on the flow bench 240cfm Intake and 200cfm Exhaust @.550 lift.

They chose rockers and pushrods for each head tested to find the best combo and I don't have the info handy on those.

 

[90LX306]

So did it make 396 Horse? if so then whats the 288 average for? My car currently is not making 396 flywheel horsepower, i think its around 260 i believe.

 

[CRASH7772]

So did it make 396 Horse? if so then whats the 288 average for? My car currently is not making 396 flywheel horsepower, i think its around 260 i believe.

396 was the peak HP. The average is between 3000 and 6000 rpm, looking at the graph they had around 200HP at 3000 rpm.

 

[Mike86Stang]

That's flywheel HP which would translate to 330ish at the wheels.... but that doesn't matter 1 b/c there were no accessories which can cost around 5-10% of your HP (guessuing) 2 it was fly wheel your figures are rear wheel. Your making around 370ish flywheel hp ... I think the TFS cam has got to go as well try a stage to or throw that comp cam stick back in it.

BTW sounds like the car was a little fat... you could lean it out & try more timing & that would probably put you over 300rwhp as is.

Mike