sk8world

iTrader: (5)

Guys check out this 2 stage drag rev limiter for the supra. Its pretty cool. I wonder if one will be available for our cars soon or if that one with differant harness might work??

http://suprastore.com/msddirigsys6.html

relvinnian

Haven't clicked that link, because dial-up is my daddy.

Anyways, two steps are built in to most new ignition amps (6A, DIS, Hi-6), and most stand alones as well I believe. I know haltech has one. It's just like a regular rev-limiter, it just happens at an earlier designated RPM, so you can put more load on the engine, without bouncing the car off an 9k limiter and spinning

sk8world

iTrader: (5)

I think this is different. Not just to prevent you from over rev's but more like a studer box. If you check the link you will see what I am talking about.. Anyone??

MikeL

FYI in case some don't know: The Haltech has the two rev limiters built-in. Probably other aftermarket ECUs do too.

sk8world

iTrader: (5)

You telling me that a Haltech will alow one to build boost before you leave the line?? Has anyone even clicked on the link? As far as I know there is no such thing available (with out allot of conversions) for a 5sp rx7 that will allow you to build boost Before you leave the line! Anyone can shed some light??

MikeL

MikeL

There is also a Haltech function called "Anti-Lag".

RXTASY1

I know the Haltech has all these functions, but has anybody got them to work on a 7?

MikeL

When RP built my engine, they offered to do either one. I didn't understand it and said no.

SPOautos

Yea, the Power FC has it as well. Its weird cause it was in the programming of the pfc just not activated. When they hacked into it with the datalogit that found it and got access to it. So wola, the PFC has anti lag. The way it works is something like this, it retard the timing and dumps some extra fuel to create hot egt's which spools the turbo. I've heard it works real well and while its doing it you'll be burning a big *** flame!!! Its clutch activated so when you let off the clutch everything goes back to normal.

Seems like they said with stock twins you can build full boost off the line!!!!!

STEPHEN

sk8world

iTrader: (5)

I asked Ari last year about this and I do not remember the exact details but it seemed you needed much more than just a ecu to do this. You know how you here the guys at the track with their studer boxs?? I think this set up is similar to that. I will know more as a guy in town has this on his supra and will be at the track Friday! I here he goes 7.6 in the 1/8th with not much more than the bpu and this launch device.

relvinnian

Yes, that is exactly what I'm telling you. Refer to my original post, and SPOautos' post. 2-step and stutter box are the exact same thing. It's called that because it the rpms "stutter" as the bounce off the separate rev-limiter.

SPOautos: You are correct, but it is not called anti-lag. Anti-lag is a function of controlling the wastegate, so it stays completely shut until the desired boost is reached. It reduces "wastegate creep" to zero.

peejay

I thought stutter boxes were similar to throttle stops, as a way to ensure the car runs an certain time. (For indexed drag racing where a car can't go faster than, say, 8.90 without being DQ'ed)

But I *know* that anti-lag is not what you describe. Anti-lag is a way of keeping the turbo spooled up when the throttle is closed. Most common way I know of (ECU-controlled) is dumping a ton of fuel into the engine and retarding the timing a lot when the throttle is closed from high RPM. When you let off the throttle to shift, all that fuel burns basically in the exhaust manifold instead of the engine, and it keeps the turbo spinning like mad (as well as popping and banging a lot )

sk8world

iTrader: (5)

So I wonder why "The Supra store" is making such a big deal about this NEW device and saying long awaited! When all they needed was a Haltech or such... Has anyone seen or heard of a 3rd gen using this option successfully???

MikeL

Dude, a stutter box is a secondary rev limiter. The Haltech and other ECUs have it built-in.

If you can launch at your normal rev limit, you don't even need the stutter box (the low 9 second TII member here).

If some don't plan to go aftermarket ECU, the thing you are talking about seems to be a nice item.

sk8world

iTrader: (5)

I understand what you guys are saying but I can not believe this would not dropped the ET time allot by starting out with say 6-8 lbs of boost! I mean you read about all the single turbo guys using NOS to prespoll why not go this route?? The guy with the Supra that has this in town said it made a huge differance in his ET's..

MikeL

WE have given you the information. I'm done with you. Don't contact me. I deal only with people that have a brain.

fdracer

funny ****, man . this stutter box is just a regular 2-step. and antilag is just how spoautos and peejay explained it, basically turbo is spooled by really hot egt's.

RETed

Cause rev limiters and timing retards sitting there at the start line elevates EGT's...&nbsp Just to recap, what you're doing is igniting the fuel mixture way later into the exhaust system.&nbsp The fuel in literally exploding inside the turbo turbine section - this gives it the power to create boost just revving there.&nbsp Elevated EGT's KILLS turbine wheels - this is why "cost-conscience" races do not use a "stutter box" or "anti-lag" features.&nbsp This is a quick and easy way to kill your turbo...



-Ted

fdracer

Actually high egt's are why "anti-lag" or "pre-spooling" is only used at the line. If it's used properly and not used too long, it can be relatively safe.

RETed

Uh, no.&nbsp You're doing this that are unnecessary for a street vehicle.&nbsp Race cars do it cause they want to eke out every last ounce of power, and they are prepared to replace parts (i.e. turbos) is necessary.&nbsp WRC cars replace turbos after almost every LEG - they carry two spares for each car for each "pit stop" (top teams), cause the anti-lag shifting really pounds the turbine wheels.&nbsp There is no such thing as "not used too long" - any use of such a system (stutter box or anti-lag) is increased load on the turbo; it's not IF there's damage, it's a matter of WHEN the turbine wheel is going to come apart.



-Ted

sk8world

iTrader: (5)

Thanks for the info RETed and fdracer. MikeL thanks for the smartass remark!! And dont worry I will not contact you, AS I NEVER HAVE!!

87GTR

iTrader: (61)

ummm anti lag is used between shifts to keep the turbo spoolled up. ( retards the timing and dumps in some extra fuel )

relvinnian

Thank you for re-inforcing what everyone else has already said

Thanks for the info guys.

quick94

i read that someone mention that the power fc has a built incontrol if so can that guy reply to this with email or pm me or email me at redlineracer_91@hotmail.com that would be great thanks ed