You are right. I am estimating my trap based on facts.

Fact #1) from 45 roll I pull on a all motor 02 Maxima that traps 107mph.

Fact#2) I ran door to door from a 45 roll with a H/C (basically a LT4) LT-1 6 speed Z-28 that traps 107.9 mph

Fact# 3) I run door to door with a Mustang that traps 107mph

We can compare slips too. Here is the thread where the 02 Maxima I raced posted his timeslips:
http://www.forumco.com/undergroundra...e=Street+Smack

And here is what my slip looks like:
60' = 2.01
330' = 5.60
660' ET = 8.58
MPH = 83.999 (LOL)


But we're digressing. The RP calculator tool might be useful for estimating but thats about it. It was off not only on my ET but also my MPH the most.

 

You should have stopped at "I am estimating".

You're assuming that just because a given car traps X in the quarter mile that it has linear and comparable acceleration, and they don't. You're comparing apples and oranges when you try to compare quarter mile trap speed and the results from a 45-mph roll, because all cars, especially turbocharged cars, don't accelerate at a linear rate.

Your turbos, lighter weight, and aerodynamics give you an advantage against the Maxima from a roll, and the only reason the Corvette and the Mustang are able to hang are because they have a midrange torque advantage.

It was spot on for trap speed for my FD, my Supra, and my Z06. *shrug*

E.T. is the estimate, because there are too many variables that can affect elapsed time, including not driving the shortest path from point A to point B, traction, driver skill on the launch, etc. Trap speed, on the other hand, is very predictable based solely on weight and power. Unless you miss a shift, calculations like this are pretty close to real world results.

And Red-Rx7 is right... NO stock FD putting down 219 RWHP traps 107+ mph.

 

Jimlab, that post makes a little more sense that Red RX-7s.

You bring up some good points. Only thing I can really do is bring it to the track and see what I can do.

As for no stock FD trapping 107, you could be right. Maybe I won't trap 107. That was pure speculation on my part given my real world experiences and other's timeslips to compare to.

I dyno'd 216, 217 and 219 about 2.5 yrs ago up in NY. Since then I've done a silicone vac hose job and Pettit ground strap. Maybe my RWHP went up since then?

 

One thing I forgot to mention is that turbocharged cars heat the incoming air by A) compressing it, and B) routing it past the exhaust system, so they're affected more by ambient air temperature (especially an FD with a stock intercooler) than a naturally aspirated car. Cooler temperatures are called "turbo weather" for a reason.

On the other hand, naturally aspirated cars (and supercharged cars, to a slightly lesser extent) are more affected by DA (density altitude) because they can't compensate for thinner air like a turbo car by keeping a wastegate closed longer to make the same boost level it would at sea level. A turbo car can make the same boost at sea level and at 4,000 feet simply by "working harder" at higher elevation. Belt-driven superchargers don't have the ability to spin faster than a linear ratio of engine rpm, so they can't compensate nearly as well, and naturally aspirated cars drop about 3% power per every 1,000 feet of elevation.

Also, turbochargers love a load. In higher gears, they typically produce more boost than in lower gears, and more quickly, which is why turbo cars can accelerate faster in higher gears than a naturally aspirated or supercharged car, which has very linear power delivery in all gears.

Those are just a few more factors that could affect the acceleration of a car that trapped X mph under certain conditions.

 

Sorry. I stated the same thing Jim did; without elaborating why. Sometimes one just takes knowledge for granted, thinking other people understand the same thing.

 

At around 69,000 hp and 1000 lbs you can run negative E.T.'s


How many rotors would it take???

 

207

 

E.T.: 10.9
Trap Speed: 128mph

the worst thing about calculators is when you use them while your car is in the shop finishing up tweaks on its new single setup. sucks.

 

Im too lazy to check but for some reason I think that might be the actual answer. lol. "pictures lab with calculator and scratch paper"


I love finding threads in them with the old school forums crowd having an old school conversation.

 

You MIGHT have gained back 5hp that was once there but got lost if you had bad grounding. But 220-225 is good RWHP for a stocker.

An intake, downpipe, and muffler will actually make a big difference.

Dave

 

I'm going to look into a cat back for the time being. I need to get into the tranny and fix the clutch. I had some wicked launches when i was at the dragstrip and I think the 4500 RPM clutch slips killed the stock clutch. So the plan is to fix the clutch first, put a lightweight fly in there while its apart and if I have enough dough left over, source a quiet catback and put it on there. I think with that I should be able to ET somewhere around 12.8-12.9, maybe 12.7s with slicks

 

ive got an apexi n1 dual with silencers and a downpipe that you could pick up for less than an exhaust elsewhere. all good condition. less than 10k miles on the stuff.


j

ive got a midpipe I could throw in as well if yer interested. 450 bucks for all of it.

 

Damn, Jason, that is a great deal.....I am interested for my 90 vert. I wonder how much fabrication it would take for it to fit......160 hp with a 3 inch exhaust would be, um, retarded

 

i was under the impression that convertibles are not aloud to run at the dragstips if they ran less they 11;s or sumthin close to that?
NOT SAYING IM RIGHT JUST HEAR-SAY- JASON

 

Artguy, thanks for the offer dude! The N1 is a bit louder than i would prefer, but how much are you asking for the downpipe and is the midpipe *resonated*? Also, can you tell me what kind of downpipe it is? Thanks.

 

Convertibles running 13.99 (NHRA) or 13.49 (IHRA) or faster have to have a roll bar. To run 8.9s, you have to have an NHRA-certified 10-pt. roll cage and NHRA competition license.



2001 videos (copy shortcut and paste into your browser URL address field)
http://www.f-bodyhideout.com/videos/baxter_9_11.wmv 9.11 @ 154.53
http://www.f-bodyhideout.com/videos/baxter_9_04.wmv 9.04 @ 155.33

He eventually ran an 8.9 @ 153.