Just decided to go for a couple more runs using my friends g-tech.<br>Weather 64F 18C Level Road, Clear Day etc etc.<br>Ran a 13.63 sec @168.9 KPH / 105mph ! what does a M3 do again?<br>Had a very clean a good take off, changed gears solidly but not abusing them, clutching very quick (not far from from flat changing) 1-2 change @6600rpm 2-3 @6300rpm<br>2-4@6100rpm.<br>Tubo pressure upto 5500 was a touch under 14psi<br>Turbo pressure @6500 rpm was holding 11psi<br>The First Run only netted 14.6sec bogged down on take off and was changinging @6800rpm<br>A run just after the respectable 13.63 only netted 14.5 sec, the engine bay was already warm, this only confirms what i posted a while ago about air flow probs in the A4.<br>All I now have to workout is what to do about the Intercooler, Fresh Air Intake ducting and a better airflow around the turbo area, and I should be able to achieve consistant high 13's or flat 14's.<br>P.S. I do have a very good suspension setup so critics can add 0.2 secs onto my g-tech time if it makes them feel better.<p>BMW usa quotes 14.3sec 1/4 for a M3 Does this mean I have a M3 Killer by running a 13.63??<br>

14.3 sec for the M3, and a large part of the reason for the "quantum" difference between the M3 and the Dinan M3 is that the German government actively attacks false advertising, or anything approaching false advertising in two categories: safety, performance. If you advertise 14.3 seconds, you had BETTER be able to do it in 14.3 seconds, with whatever car you have on hand, even the one Hans was busy fooling with last week, even when the government checks on that car at 1AM on a Sunday, you'd better be telling the truth by the government's stopwatch, or you have serious problems... and serious problems with the German government are needed by German auto manufacturers about as much as another die-hard union supporter on the board of VW or a hole in the head -- the same thing if you ask a few of us...<p>Cameron<br>

<br>13.63 @ 105? sorry but you need at least 300hp to run that number, G-Techs are far from accurate

Well a race track properly setup for 1/4 is the final word,<br>The g-tech is only a guide, some swear by it, i am wouldn't take it as gospel.<br>How ever when i ran that time, by the time i looked at my speedo it was at 170KPH.<br>So I must be some where close.<br>How ever where it is accurate is where i run a poor time, you can feel less pull in the car and it is every time after i have just completed a run, so it is accurate in reporting<br>heat build up in turbo/intercooler etc.<br>What is popular here are 5 liter Ford&Holdens(Chevs) They pull high 14's and low 15's, i beat them convincingly.<br>

i agree heat is a problem, i remember when i was dragging a 250hp A4, allthough consistent, with 95 degree weather i knew the car wasnt producing the power. but 13.63 is too fast, what did u use as your weight on the Gtech? i remember gettign a 12.57 on a Gtech but realized i underestimated how heavy my car was. my car ran 13.6's @ 100mph, and that was 320hp and 4000lbs. i knew it could do better if i had a new clutch, but i honestly feel that 250hp in an A4 is good for low to mid 14's with trap speeds around 95mph. My friends 400hp 300zx does a 12.5 at 110mph, so 105 doesnt sound possible to me. Using math it seems at 3500 lbs at 65 deg weather u need about 325hp to hit 105mph in the 1/4

Hey Lucas,<p>From those figures I guess you are getting more than one Kw extra out of the K04 now over the K03 with the Wett chip...<p>I bet you still wont get a good dyno power run, unless you cake the intercooler in ice, but you know all about the heat problem first hand now.<p>Wonder what that set up would do with a set of cams in it??? <p>Was wet today in Sydney, time to play urban guerilla with the quattro!!!<p>Graham

Cams, no not yet.<br>First Fix heat problems, once that is done, next will be to decomp the engine to 8.5-8.9 to 1, So I can run at least 15psi and then cams to make up for loss in top end fromturbo running out of puff.<br>There is no point in in changing cams if my motor pings already with 15psi, cams will only want to put more air/fuel into a bad situation.<br>If you ring Denlo in the next few days, see if they stock 8.5 to 1 pistons & rods, may be<br>i might just get the TT ones.<br>But the Heat problems is first before i do anything more.

This is info Zsolt posted about vehicle weight:<p>This morning I took my tqms to a truck weight station. Paid $6 to get the<br>following info:<p>3420 lbs with driver<br>1940 lbs front axle<br>1470 lbs rear axle<p>This car is a 98.5 with sunroof, quattro, sport pkg, manual tranny,<br>underhood insulation, FULL tank. It has CD (non-bose),<br>cargo net, had a CLUB, radar detector, G-Tech Pro, flashlight, couple of<br>maps in it, otherwise completely stock (well, it<br>was debadged:).<p>Based on his vehicle weight what do you speculate the car should do with the K04? I was shooting for low-mid 14's when I started down this path.

Hmm I think if the turbine of your turbo unit is too restrictive then cams may not help the top end much..perhaps a larger a/r or a new turbine is in order. or upgrade the compressor is it is to small to hold boost over 15 psi... or just upgrade the turbo to something the next step larger..

ok,quattro, 3420 lbs, ambient temp, you should get 14.3 @ 94mph with a 1.9 60 ft time.

Cam shafts change to abount of time the valves are open and how the exhaust is expelled.<br>Given a Fixed PSI, longer duration cams allow the cylinder to fill up a bit more.<br>By Increasing slightly PSI on the same cam acheive a similar result.<p>This is whyturbo charged cars generally run 20% less duration in cam timing<br>than normally aspirated.

I've seen that if you begin to run 1 to 3 or 1 to 4 in the ratio between intake manifold pressure and exhaust manifold pressure you are fighting an up hill battle with a turbine or housing that is sized to small.. From my work with supras and Z's you don't see massive gains in top end power until the back pressure is brought down to a tolerable level..

13.63 at 105 mph is pretty good on the g-tech! I would say that it will probably beat a stock M3 (or neck in neck), my M3 stock did a best of 14.0 at 103 mph (of course I only made one fairly soft run with the g-tech, I try not to be too abusive to my baby).<p>Contrary to the bs that some people seem to randomly spout off about the g-tech being inaccurate (they probably haven't even played with one), I find the g-tech quite accurate for what it is. It is an accelerometer, so it is very sensitive to g-forces. Thus you must be on a straight level road, and make sure you are completely stopped when the thing is initializing. Then remember that when your car takes off, it rocks backwards which tilts the g-tech back a bit, which makes it think your are accelerating a wee bit faster than you really are. BUT it is quite consistent, depending on how much your car rocks back (hard/soft suspension, quattro launches will probably give more error since the car can really rear back on launch) you can add .2-.4 seconds to your 1/4 mile time and subtract 1-3 mph from your trap speed, so your time is more like a real 14 flat or high 13's at around 102-103 mph. Not to shabby!<p>Brad Franklin

But it's an A4 killer when you're dragging an M3 and you decide to hit the brakes when the M3 hits the brakes ... LOOK OUT FOR THAT CLIFF.<p>More to being an M3 killer than 1/4 mile. IMHO.<p>Chris Gröos