951_RS

but if the axles break so easy they are crap and need to be replaced with stronger ones. if the clutch is that weak, buy a good one. if the tranny is so weak it can't handle 300 whp i dunno what to say

badass951

The real question is, do you have any idea what you are talking about?

MPD47

It sure as hell doesnt seem like it. 951_rs have you ever drag raced a 951?

Robby

Exactly- SCC did a great article several years ago RWD vs FWD vs AWD- two of each, the AWD's were modded- Turbo Talon & A4- BOTH were faster from 0-60 on wet ground than on dry (although it was VERY close) b/c the tires would not allow enough slippage on dry ground.

I've only done a few full-throttle standing launches w/my stock Turbo S & it's VERY obvious that spinning the tires will bring me out of the hole much faster than only slipping the clutch, etc... no doubt about it... Although, I'm sure there's a point where spinning the tires TOO fast would be counter-productive...

Also, many people on this board like to thing 951's are faster on the highway, etc, than off the line, as if the cars can't do much off the line compared to newer cars, but can always catch up with them at higher speeds & get around them... A stock 951 is EXACTLY where it should be in terms of both off the line AND high speed roll-on... A Turbo S runs 0-60 in 5.5sec, correlating almost PERFECTLY w/it's 14.2sec 1/4, & 0-120 of ~22.0sec- almost perfectly linear accel from standing start all the way up. Compare to later E36 M3s- 0-60 in 5.5, 1/4 mile @ 14.0 & 0-130 in ~25 sec range (never seen 0-120). Does this mean the 951's a better launcher than the M3 or that the M3 is a better roll-on car? The M3's short-*** gearing just helps it everywhere. I think it shifts into 3rd before 60(?). The 951 shifts ~63 (redlines 67). The C&D tested 951 w/3.65 FD shifted just before 60 for 5.5sec, but it's 1/4 mile dropped to 13.9...

Oh yeah, as for what is the weakest link, I personally would rather spin my tires a little too much than break expensive drivetrain parts... Sure, you can run slicks, etc, but then, you'll be hooking up better, which will in turn, put more pressure on the drivetrain parts... Anyway, that's just my $.02...

Imo000

I was wondering the same thing about you! You are taking my words too literarly. How many times can the tires break loose before you need to replace them.... 50... 100??? As for the CV, once it snapps, it's game over for that day. Trust me.. the tires should be the weakest link.... I rather have my tires break loose than anything else.

badass951

I took your words literally eh? Man I must be a retard.

Imo000

I was trying to be nice by not saying that you didn't understand what you read. You interpreted that the tires would be roasdted on one single pass. That's not what I wrote.

badass951

I definitely understood you from the beginning but thanks. Clearly a set of tires can not/should not be roasted in one run - this is obvious enough for anyone to realize. Now, when you say you prefer the tires to be the weakest link, you are basically saying that you don't want to lay power down, as I have gone through axles with crappy Sumitomo tires. Guess you will have to buy something of even lower quality then to have your car setup to have the tires as the weakest link. If you are laying down 300rwhp, you will eventually go through a set of axles.

Imo000

You are right, at the launch I am not putting down all the power available, but a 2.06 60' is good enough for me. I'm already laying down ~350rwhp. and the axles are originals. So far 40 1/4 mile passes withouht any break down.

Robby

Obviously both of you guys have points here- stickier tires are going to hook up better & also put a lot more stress on the drivetrain parts- the more power AND grip you get, the more stress on drivetrain parts... It's all relative- I mean, if you launch a bone stock 951 enough times, you will break something eventually- more power &/or grip only increases the chances it will be sooner... It's not very likely that even a 500RWHP car would break axles, CV's, etc, on the very first run, assuming said car is in very good, like-new condition... Sure, we all want to be able to get power down, but at some point, we have to ask ourselves what we want out of the car.... Most people say Porsches were never meant to be dragged anyway. But, tell that to Eddie Bello in his 8sec 911...

The chance of breaking something is also a good reason to race from a roll in higher gears rather than launch from a dead stop... In 1st gear, a Turbo S puts 3052lbs/ft TQ to the crank at 4K rpms... In 3rd, it will hit ~1220lbs/ft. Just to list them all: 2nd = 1796, 4th = 900, & 5th = 725. Notice how 3rd only puts down ~40% of 1st & 1st puts down more than 3 times what 4th does... Not to mention the immediate jolt from a standing start in 1st...

imo000- what's your best run at the 1/4? I'm not too up to speed on what a good 60' time is, but getting near a 2.0 sounds pretty good- just trying to see what that would correlate with in the end- time & speed...

badass951

What mods do you have if you don't mind me asking? So are you then saying that you personally do use a tire that will spin very easily at launch without slipping the clutch to avoid driveline stress? If so, aren't you curious to see how fast you can really run the 1/4?

Yup, it's all relative.

Imo000

My best to day was last year, 12.8sec @ 109mph...... here is the link with rest of the details. http://www.dragtimes.com/Porsche-928-Timeslip-6742.html

Imo000

I built a supercharger sysem for it, and have a set of chips in it, but other than that the the car is stock. It's an '85 928, 5-speed, 32V.

Here's the site that shows how I built it. http://norcal928.org/DIYSC/index.htm

Robby

12.8 @ 109 is pretty damn good... I thought it was a 944 though, but still... the 928 has the same transaxle configuration- only major dif when it comes to dragging is the V8 should certainly be easier to launch....

MPD47

The 928 transaxle is completely different from the 951 one. Not even a decent comparison. When I was nearly stock I pulled a 13.9 @ 102.