[Nickf10]

Who dyno there car from.second gear? I mean seriously. I simply said when he was in fourth gear for the first couple of runs it wasn't opening the throttle. So since your so smart why wasn't I making more power in fourth then when we did the pulls in fifth gear?

[tdizzle]

Originally Posted by ShlemonboostedM

Still amazing results .. i have same mods except Intake and charge pipe.. so if am at least at 370whp thats Fawking Sweett... I'm curious what would u put on straight 93..

Show me any E9x N55 thats put down that much power with his mod list..

With E85 in Map 7, Terry's tuner car was doing right at 370whp. Without, about 355whp in Map 2.

[Bowser330]

If Terry's dyno of 370whp was at 18.5psi then its entirely possible that an additional 1.5psi + intake +chargepipe +exhaust could yield 25whp more.

[rallybull]

Originally Posted by F32

Dyno pulls are supposed to be done in the car's 1:1 gear (or closest to), which in the F30's automatic is 6th. Gears are torque multipliers, and HP is merely a derivative of torque. Of course numbers will be inflated if a lower gear is used.

Put a stock Honda Civic on that same dyno in 2nd gear and watch it put down 500 WHP. Pretty damn impressive. But on top of that...we all know that outright dyno figures with no basis of comparison mean almost nothing.

You are correct about the torque multiplier aspect, but you are overall incorrect.
Most dynos worth their salt (dynojet included ) will detect the gear ratio and will compensate for that fact proportionally. The lead that you plug into the engine wiring allows the engine to detect this ratio. In fact assuming transmission losses are minimal at a ratio closest to 1:1, running the dyno in a gear other than at 1:1 will only slightly reduce your "dyno computed" numbers at the wheel.

[Bowser330]

+1 that's what I read on many other forums where people were discussing this very topic

[Steve33]

Originally Posted by rallybull

You are correct about the torque multiplier aspect, but you are overall incorrect.
Most dynos worth their salt (dynojet included ) will detect the gear ratio and will compensate for that fact proportionally. The lead that you plug into the engine wiring allows the engine to detect this ratio. In fact assuming transmission losses are minimal at a ratio closest to 1:1, running the dyno in a gear other than at 1:1 will only slightly reduce your "dyno computed" numbers at the wheel.

They have a fudge factor but it's pretty generic for the compensation. Dynojets are known for having overinflated numbers anyways. Do a pull in 4th and then in 6th. The numbers will have a difference that is greater than can be explained by a normal variance between pulls.

[btbossman]

F32 is right however...the pulls need to be done in the closest gear ratio 1:1, lets see what happens in a few days in 6th.

[rallybull]

When I did my dynos in 4th, 5th and 6th gears, there were no differences. I had created a thread posting the various dynos.
Btw, if you are doing dyno at 6th gear, make sure you have performance tires. My V-speed A/S tires smoked badly at 145mph

[F32]

Originally Posted by rallybull

You are correct about the torque multiplier aspect, but you are overall incorrect.
Most dynos worth their salt (dynojet included ) will detect the gear ratio and will compensate for that fact proportionally. The lead that you plug into the engine wiring allows the engine to detect this ratio. In fact assuming transmission losses are minimal at a ratio closest to 1:1, running the dyno in a gear other than at 1:1 will only slightly reduce your "dyno computed" numbers at the wheel.

This is not from my experience.

I've never heard of a "lead that you plug into the engine" that detects what gear the car is in and compensates, but I only have about 80-90 dyno pulls of experience in various cars over the last 10 years. The only information the dyno will pick up from the engine is RPM. I've also never cared to have my tuner plug in any sort of correction factors to the results, as correcting anything is inherently useless.

Perhaps the variance you experienced in different gears wasn't great due to how tight the gears are spaced in the 8-speed, but there will be a difference to the upside in a lower gear. On top of torque being multiplied at a higher rate, a shorter gear doesn't allow for as much load and therefor heat.

[Bowser330]

Originally Posted by F32

This is not from my experience.

I've never heard of a "lead that you plug into the engine" that detects what gear the car is in and compensates, but I only have about 80-90 dyno pulls of experience in various cars over the last 10 years. The only information the dyno will pick up from the engine is RPM. I've also never cared to have my tuner plug in any sort of correction factors to the results, as correcting anything is inherently useless.

Perhaps the variance you experienced in different gears wasn't great due to how tight the gears are spaced in the 8-speed, but there will be a difference to the upside in a lower gear. On top of torque being multiplied at a higher rate, a shorter gear doesn't allow for as much load and therefor heat.

Pardon me for not taking your word for it, but I have read a lot of things that conflict with your position on this...would you happen to have any dyno graphs that can help illustrate your point from the 80-90 dyno pulls you've experienced?

Without illustrated evidence one way or another the only way we will get this settled is if NickF30 goes back to the same dyno under similar conditions and dynos in 6th gear (8AT 1:1) to compare the results....NickF30 is this possible for you?

Or....

If someone else can post two dynos of their car in 5th and 6th gear (8AT 1:1)

[F32]

Originally Posted by Bowser330

...would you happen to have any dyno graphs that can help illustrate your point from the 80-90 dyno pulls you've experienced?

No...I've never wasted my tuner's time by dynoing in different gears.

[Bowser330]

Originally Posted by F32

No...I've never wasted my tuner's time by dynoing in different gears.

Forget I asked you.

ANYWAY....

NickF30 hopefully you can get sometime back on the dyno to test out 6th to see if there is any disparity...

[CJ2]

I'll be putting my F30 on the dyno tomorrow. Hopefully my tuner knows which gear to put the car in. I'll also ask him about the gear factor; if anyone cares..

[Bowser330]

Originally Posted by CJ2

I'll be putting my F30 on the dyno tomorrow. Hopefully my tuner knows which gear to put the car in. I'll also ask him about the gear factor; if anyone cares..

Cool, do you have 8AT or 6MT? Any mods?

[CJ2]

Originally Posted by Bowser330

Cool, do you have 8AT or 6MT? Any mods?

8AT

Mods: JB4 stage 2, ER 4" downpipe, 50/50 E85/91.

Running Map 7 and hitting 18.5psi currently.

[Bowser330]

Originally Posted by CJ2

8AT

Mods: JB4 stage 2, ER 4" downpipe, 50/50 E85/91.

Running Map 7 and hitting 18.5psi currently.

NICE! Can't wait to see what you can pull

[tdizzle]

Originally Posted by Bowser330

NICE! Can't wait to see what you can pull

367.2 whp!

[CJ2]

Originally Posted by tdizzle

367.2 whp!

That'd be awesome. My IS-F dyno'd 359whp 334lb ft torque last year.

Hoping the F30 can best that number. I'm sure it will torque-wise. Having a hard time keeping these damn Pirelli Pzero run-flats on the ground in 2nd gear..

[tdizzle]

Originally Posted by CJ2

That'd be awesome. My IS-F dyno'd 359whp 334lb ft torque last year.

Hoping the F30 can best that number. I'm sure it will torque-wise. Having a hard time keeping these damn Pirelli Pzero run-flats on the ground in 2nd gear..

Oh yea, torque will be over 400 at the wheels easy, probably closer to 500.


Edit: Time for some Mich PSS or Conti DW!
(PSS suck when it's cold though, like hockey pucks, but I don't think the run flats were any better)

[Sedan_Clan]

Forgive my ignorance, but aren't the charge pipe and the downpipe the same thing? If not, what's the difference?

[F32]

Originally Posted by Sedan_Clan

Forgive my ignorance, but aren't the charge pipe and the downpipe the same thing? If not, what's the difference?

Chargepipe refers to intercooler piping into the engine. Downpipe is the piece of exhaust connected to the turbo.

[Sedan_Clan]

Originally Posted by F32

Chargepipe refers to intercooler piping into the engine. Downpipe is the piece of exhaust connected to the turbo.

Okay, now I see. I've seen the two terms used interchangeably, hence my confusion. Thanks man!