m21sniper

I have a 1983 928S US A/T model.

It's pretty quick now(13.67@103.1 is my best ever run), but i'm looking to add a small(50-75hp) shot of giggle gas(see there was this 04' Modena i ran into a few weeks ago, and well, i didn't like the result very much, not very much at all...).

I know a few of the lads here have some first hand experience gassing their sharks, and was hoping you good folks could point me in the right direction wrt a good 928 compatible system, suitable timing retard control, etc, etc.

I have a variety of questions that i'll hold off on until i get a reply.

Thanx much in advance.

jserio

Andrew, yer up.

Lance J

hey sniper its lance from new jersey. my setup was a 75-100 shot. for the euro. thinking of doing it on my 79. andrew and mark have great amount of knowledge on this. if you up your fuel flow you should be fine (safe) with 75-100hp. let me tell you guys sniper has a very very fast shark. he spank my 83 euro from a dead stop by 2-3 cars. but the euro did live up to his name on the highway. anyway sniper 75hp is a great setup to start out at. as you gain more control over your fuel flow. (meaning larger injectors more fuel pressure) but if you want to run more go with propane injection like the viper guys do wont say how much more nos you can but it rasies the octane to 112

Normy

Wow. 13.67 is pretty damn fast for a US-spec '83, especially with an automatic transmission. Care to share with us just what mods your car has?

N!

mark kibort

NOS is an easy trick with the 928S from 1984 and earlier.

see andrews posts. He has my old system working well.

MK

Lance J

hey normy he has the timeslip to prove it. so far i know he lightening the car, cool wall intake runners, advance timing, electric fan. his stall speed in real high also that helps his lauches. thats if all i can recall. i'll let sniper tell ya the rest. no force induction that i'm sure.

Imo000

I've been talking ot Snipe on the 928S4VR for a while now. I can assure that his times are legit. He bught the car already very fast and did some minor modifications to make it even faster. If I remember right , he also did some weight reduction on his 928.......13.6sec. 4.7L auto is way more impressive then my 13.54 5-speed 5.0L. (I know....my avatar has a typo)

It's funny that he too is not exactly sure either why he's 928 is so much faster than normal.

mark kibort

my 1984, with a stick was close to 12.5 seconds just 60-100mph. it dropped down to 9 seconds with the intake, headers, and some lightening (ie 175 at the wheels to 240 at the wheels
then, with the 5 liter euro and some major lightening, it went down to a very fast and S4 like 7 seconds. (at 290hp at the wheels) The Holbert S4 dropped it down even farther to 5.5 seconds. (probably close to very high 11s to low 12s for the holbert car if you take 0-60 of about 4.5 seconds and 5.5 seconds, plus another 2 from 100 to 110mph to get the final speed of a 12 second 1/4 mile.

I have a hard time believing an 83 auto can run low 13s. without some serious mods or a very unusually strong engine. (ie 230 + at the rear wheels)

mk

m21sniper

"I have a hard time believing an 83 auto can run low 13s. without some serious mods or a very unusually strong engine. (ie 230 + at the rear wheels)"

I get a lot of that.

What lance- sly devil that he is- failed to mention was that his 83 Euro was running a 75 shot of nitrous when i raced him that day...

We also had another 928'er there the same day, Heather from the board i normally post at, she has a 'mostly stock' 83 US A/T.

I beat her by about 12 car lengths from a standing start(lance was there for that too, he beat her by 9, lol).

To be honest i really see nothing hard to believe about a modified V-8 powered car that weighs 2900lbs running a 13.67(in fact i don't even consider it particularly impressive- and just for the record 13.67 is my best ever time.)
Imre's car is the one that really surprises me. My ex-partner Tim had an 85 US 928S A/T and his was definitely not as fast as mine, so the fact that Imre's 5spd stock shark is down in the very low 13s is quite impressive.

As far as mods the only radical thing i really did was shave a ton of weight, a bit over 300lbs i reckon. The rest is just basic bolt on stuff that works on any engine, but again, the car was already significantly faster than a stock US 928 when i got it.

Rest assured if the motor ever blows up i'll be taking a careful inventory of exactly what's in it for the rest of you 16v shark owners.

But one thing i can tell you fellas, if you lower the airpressure in your rear tires to about 28psi vs the OEM rating you'll launch MUCH harder(the factory PSI rating is just way too high for drag racing, and really kills the 928s launch). Just by making that one mod alone any 928 will shave a few tenths 0-60 and 1/4 mile.
The 13.67 was my best run the last time i tracked the car(about a year ago), and it was achieved with 22psi rear tire pressure, a burnout, 50psi in the fronts, 1/8th a tank of 100 octane Cam II gas, the engine timing advanced to beyond the point of sanity, and a nice cool day. The plugs and filters were also brand new at the time.

In 'street trim' my car is obviously not going to be as fast, but i've certainly spanked my fair share of Cobras(not the 04 up though, they're high 12 cars), LT1s, and WRXs. I run about door to door with LS1 F-bodies depending on driver skill and launch traction(WS6s and SSs are a bit faster, and usually beat me by about 2 lengths). I havn't raced a lancer Evo in a while, but the last one beat me by about 2 lengths too. I only ever raced one STI, and he beat me by about 2 1/2.

I raced a 2004 Modena about 3-4 weeks ago and he took me by about 4 lengths to 100mph...hence my desire for Nitrous. It really chaffed my *** knowing that for about 600-700 bucks i could have probably ran his 200,000 dollar ferarri dead even.

Anyway, Imre, Lance, Wally, Bill, Nicole, good to see so many familiar faces here.

m21sniper

Mark what system were you running?

mark kibort

50 shot of nos express

m21sniper

Which of the kits at the following link did you use?

Wanna make sure i get the right one.

http://www.streetbeatcustoms.com/niexniki.html

PS: Sorry to be a nuisance so soon.

Weissach

Wow! 13.67@103.1 , that's GTS fast. At the track or with a g-tech??

m21sniper

Atco Raceway, NJ.

The 5.8 0-60 was accomplished on a G-Tech pro(that time would be much better if i could get the car to hold 1st gear to 6k, but the A/T shifts out of first at about 5500rpm at 55mph. If i could get the A/T to stay in first until 60mph i could probably turn a 5.6). The 1/4 mile time was a real timed run at Atco, and was my best run. I ran three runs that day, with 13.67 being the best. My worst run that day was slightly more than 13.9. Avg time for the three runs was a 13.78 IIRC.

BTW, the new Subaru forrester XT runs a high 13 in the 1/4 mile. A high 13 is nowhere near as fast as it used to be...

Weissach

Oh, that explains it.... G-tech pro is only accurate if you enter the "exact" weight of your car. If your of by even 50lbs, it will give you optimistic numbers...