335xi vs Mustang 3.7 , something wrong with my N55 xi

-Wingman- · 07-10-2014, 12:39 PM

Have two cars race, one with a passenger, one without, then switch after the first race. The results would be very different from the first time.

Try holding 200 lbs in weight. It's a lot man.

beetle6986 · 07-10-2014, 04:05 PM

Quote:

Originally Posted by -Wingman-

Have two cars race, one with a passenger, one without, then switch after the first race. The results would be very different from the first time.

Try holding 200 lbs in weight. It's a lot man.

200 Lbs might be .1 to .2 of a second across an entire 1/4 mile. Not that significant. Moving a passenger from one car to another is more like 400 LBs difference. You are removing a 200 Lb weight from one car and adding it to the other. That will certainly make more of a difference. The weight between a C5 Z06 and a 335XI (700 LBs) is significant. The weight between a 335XI and 335I not so much.

The weight is close enough that a full tank of gas, NAV, runflats, wheel size, auto vs manual, etc. could make them the same.

ragingclue · 07-10-2014, 07:46 PM

Quote:

Originally Posted by beetle6986

I'm sure the driver's experience is negligible when runnning a 300HP Auto down the strip. 13.2 is probably the average or better with those mods. That is about equal to a stock 335. Probably the fastest N/A 3.7 would have trouble keeping up with your average tuned 335. Not taking anything away from the 3.7. 13.2 is a kick ass time for a N/A 6 cylinder.

Meh the control arm bushings still stuck ass at that output so there's still a little bit of non-retard required (i.e. hop). It almost seems tragic that the V6 Mustang is as relatively quick as it is, but it will always still be a V6 Mustang.

But yeah 335s shouldn't have problems with them like OP did IMO unless something else is going on. A couple hundred pounds difference can't be the only answer.

beetle6986 · 07-10-2014, 08:56 PM

Quote:

Originally Posted by ragingclue

Meh the control arm bushings still stuck ass at that output so there's still a little bit of non-retard required (i.e. hop). It almost seems tragic that the V6 Mustang is as relatively quick as it is, but it will always still be a V6 Mustang.

But yeah 335s shouldn't have problems with them like OP did IMO unless something else is going on. A couple hundred pounds difference can't be the only answer.

I didn't know they had IRS. The V6 stang now has the power of the old V8s. However, I don't think they sound nearly as good.

-Wingman- · 07-10-2014, 11:20 PM

Quote:

Originally Posted by beetle6986

200 Lbs might be .1 to .2 of a second across an entire 1/4 mile. Not that significant. Moving a passenger from one car to another is more like 400 LBs difference. You are removing a 200 Lb weight from one car and adding it to the other. That will certainly make more of a difference. The weight between a C5 Z06 and a 335XI (700 LBs) is significant. The weight between a 335XI and 335I not so much.

The weight is close enough that a full tank of gas, NAV, runflats, wheel size, auto vs manual, etc. could make them the same.

Ok buddy. Tell that to all the car manufacturers that spend millions of dollars finding ways to take a lb off here and there, maybe going as far as to taking a few grams off in certain areas. Tell all the drag racers to keep their a/c system and interior in their cars cause .2 seconds off the 1/4 mile is really not a big deal apparently.

Id really like to see a rwd 335i race an xi to see the difference.

firemanjust1 · 07-10-2014, 11:34 PM

OP you need e85 or meth or both and you will destroy him and most other cars .Get a meth kit map3 or run 255lpfp inline with 6 gallons of e85 map5 and watch cars get smaller and smaller in rearview.

beetle6986 · 07-10-2014, 11:41 PM

Quote:

Originally Posted by -Wingman-

Ok buddy. Tell that to all the car manufacturers that spend millions of dollars finding ways to take a lb off here and there, maybe going as far as to taking a few grams off in certain areas. Tell all the drag racers to keep their a/c system and interior in their cars cause .2 seconds off the 1/4 mile is really not a big deal apparently.

Id really like to see a rwd 335i race an xi to see the difference.

Get a clue. We aren't driving a F1 Mclaren or a drag car for that matter. .2 seconds is not a big deal for a luxury vehicle and car manufactures aren't busting their balls to make a luxury car grams lighter. Lmao

AWD becomes even more important as you increase HP through modifications. The 0-60 gap only gets bigger.

FYI - I've seen them race many times.

ragingclue · 07-11-2014, 08:28 AM

Quote:

Originally Posted by beetle6986

I didn't know they had IRS. The V6 stang now has the power of the old V8s. However, I don't think they sound nearly as good.

They don't have IRS, they've got a three link, live axle and the UCA bushings have stupid play. The LCAs and their bushings are also crap but aren't nearly as much of a burden as the UCA. Hop is comical on the GTs until at least the UCA is replaced, and the V6 is also affected although to a somewhat lesser extent.

beetle6986 · 07-11-2014, 08:36 AM

Quote:

Originally Posted by ragingclue

They don't have IRS, they've got a three link, live axle and the UCA bushings have stupid play. The LCAs and their bushings are also crap but aren't nearly as much of a burden as the UCA. Hop is comical on the GTs until at least the UCA is replaced, and the V6 is also affected although to a somewhat lesser extent.

I feel your pain as I have a Cobra. They suffer severe wheel hop at times with the IRS. You can break a half shaft if you stay on the go pedal during wheel hop.

ticaohaha · 07-14-2014, 03:15 PM

Thank you very much for all your help. i think i found the cause. Currently i have kw variant 3 coilover, and the wheel spacer 15mm front and 18mm rear. The wheel after coilover flush out a little bit.
Do you think the wheel spacer setup is too much for the XI ? and the flush of coilover reduce the traction ?

07-10-2014, 12:39 PM	#23
-Wingman- Banned 17 Rep 493 Posts Drives: 2011 e92 M-Sport Join Date: Feb 2013 Location: Kansas iTrader: (2)	Have two cars race, one with a passenger, one without, then switch after the first race. The results would be very different from the first time. Try holding 200 lbs in weight. It's a lot man.
	Appreciate 0 Quote

07-10-2014, 11:34 PM	#28
firemanjust1 Second Lieutenant 32 Rep 208 Posts Drives: Audi S3/03 350z Join Date: Dec 2013 Location: buffalo ny iTrader: (0)	OP you need e85 or meth or both and you will destroy him and most other cars .Get a meth kit map3 or run 255lpfp inline with 6 gallons of e85 map5 and watch cars get smaller and smaller in rearview.
	Appreciate 0 Quote

07-14-2014, 03:15 PM	#32
ticaohaha Private 16 Rep 77 Posts Drives: M4 Join Date: Jun 2014 Location: Houston. Tx iTrader: (0)	Thank you very much for all your help. i think i found the cause. Currently i have kw variant 3 coilover, and the wheel spacer 15mm front and 18mm rear. The wheel after coilover flush out a little bit. Do you think the wheel spacer setup is too much for the XI ? and the flush of coilover reduce the traction ?
	Appreciate 0 Quote