02-16-2024, 09:21 AM | #1 |
Enlisted Member
11
Rep 33
Posts |
Track car build questions
I would like to make some reliabilty and handling improvements to my 15 bmw m4 and a couple questions about two parts.
1) catless downpipes; do they improve cooling and/or underhood temps? 2) aftermarket rear tow links; currently, the stock tow adjustment is maxed out at 2.25 degrees negative camber. I would like to increase the negative camber to 2.5 degrees and maintain some tow-in in the rear. However, I am concerned about the reliabilty of the aftermarket tow arms. Is there a known most reliable option? Thanks for any advice. Anthony |
02-16-2024, 09:55 AM | #2 |
///M Powered for Life
11500
Rep 10,333
Posts |
Catless downpipes indeed reduce temps. The car has secondary cats, so if someone were to remove the catted downpipes, it doesn't smell much. Or so I've been told.
I would definitely not track a car with aftermarket cats. Been there, done that, and it cost me an engine. I'm sure bimmerworld has a nice rear tow link, that's what I'd buy
__________________
Last edited by SYT_Shadow; 02-16-2024 at 12:37 PM.. |
Appreciate
0
|
02-16-2024, 11:58 AM | #3 |
Major
1119
Rep 1,315
Posts |
I've never heard of reliability issues with either SPL or Fall Line, I've had both (on different cars). The only issue with most of them is they use exposed Heim joints, so if you drive in rainy/salty conditions they're prone to corroding and can get squeaky/creaky. I try to remember to periodically douse them in Teflon-based lube to try to stay ahead of it.
Last edited by jfritz27; 02-16-2024 at 12:03 PM.. |
Appreciate
0
|
02-16-2024, 12:31 PM | #4 |
Major General
2335
Rep 5,796
Posts |
Removing cats will reduce under hood temperatures.
SPL, Fall Line, Ground Control, Carbahn and Dinan offer rear toe links (some offer all lower and upper rear arms, some offer covered/sealed versions). Most recommend getting rear eccentric lockouts along with the rear toe arms. They’re all quality parts with similar useable life. |
Appreciate
0
|
02-16-2024, 01:31 PM | #5 |
Enlisted Member
11
Rep 33
Posts |
My concern for the rear toe arms is based on one comment on this forum about a wreck at the track. The comment said the toe arm snapped on an m2 at a track in CA. The snapped toe arm could have been a result of the wreck and not a cause.
I have spun off the track due to an aftermarket rear toe link mount breaking. The mounting was different than stock, requiring this peace. Snapped at the welds. The tire turned in and locked against the inner fender well. I was just along for the ride after that. Not much damage due to the track layout. |
Appreciate
0
|
02-16-2024, 02:21 PM | #6 |
///M Powered for Life
11500
Rep 10,333
Posts |
I'd trust oem parts to not break way more than aftermarket ones!
|
02-16-2024, 03:33 PM | #7 |
Major General
2335
Rep 5,796
Posts |
I agree with SYT_Shadow that stock arms are stronger than aftermarket arms. However, with frequent inspection (which should be done on stock arms, too!) and preventative maintenance (e.g., replace suspension arm bolts once per season/after X number of days or as required due to off track excursions, etc.), aftermarket suspension arms can be used safely. Suspension arms are one of the last things that I do (except for front thrust arm monoballs and rear toe arms) when modifying a street car to a dual-use car.
|
Appreciate
0
|
02-16-2024, 03:36 PM | #8 | |
Captain
432
Rep 939
Posts |
Quote:
__________________
F80 M3-DCT MaxPSI CH, BM3 with F80 Paul E85 and Custom Rom track tune MCS 2Way Remotes
Signature SV104 E46 M3 F85 X5M https://www.instagram.com/fastmacm3/ |
|
Appreciate
0
|
02-16-2024, 04:21 PM | #10 | |
Major
1414
Rep 1,370
Posts |
Quote:
I have already said it a thousand times, and I will repeat it as many times as necessary. Mine customized slightly modified ready to install: |
|
Appreciate
1
M3SQRD2334.50 |
02-16-2024, 04:34 PM | #11 |
Major General
2335
Rep 5,796
Posts |
|
Appreciate
0
|
02-16-2024, 04:42 PM | #12 | |
Lieutenant
588
Rep 467
Posts |
Quote:
|
|
Appreciate
0
|
02-16-2024, 06:34 PM | #14 | |
Enlisted Member
52
Rep 46
Posts |
Quote:
I have Turner High flow dps and this makes me slightly nervous |
|
Appreciate
0
|
02-16-2024, 06:52 PM | #15 |
///M Powered for Life
11500
Rep 10,333
Posts |
Yup, aftermarket high flows. I'll never do aftermarket cats on a tracked car (again). Either oem or catless.
__________________
Last edited by SYT_Shadow; 02-17-2024 at 08:55 AM.. |
Appreciate
0
|
02-16-2024, 07:41 PM | #16 |
Enlisted Member
52
Rep 46
Posts |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|