Silver Slayer

I have been spending some time on this forum and have been reading all the diff turbo setup you guys are running. In South Africa we do alot of standing 1km sprints. My setup is not for 400m but the 1000m.

I am currently running:
1979 Series 1 Rx7
1.32 split / P Trim / AR 72 housing / 62-1 wheel / 20 psi boost
Monster street port / dowled / 2 mm race apex seals
Turbonetics racegate / Injection Perfection 50mm throttle body / 4 x 1000cc injectors / 2 x 550cc injectors activated on 16 psi / front mounted intercooler
Standard series 4 box 4:1:1 diff ratio
Microtech LTX 12
Tyres - 205/50/16

Fastest times / speed I have managed so far is:
400m - 11.715 @ 208 km/h
1000m - 280 km/h

My question is, which is the best turbo T66, T72 or T78 for the 1000m. I would like to know which exhaust wheel either P or Q and what hot side you guys would use.

Will post pics later.

moremazda

iTrader: (4)

It sounds like your set up is pretty damn fast as is. How much faster do you wish to go???

Silver Slayer

I would like to hit the 300km/h from a standing 1km sprint. It feels like the turbo I am running at the moment with the boost is limiting me.

moremazda

iTrader: (4)

Why don't you try a different rear end gear ratio??? 22" tires with the stock 3.9 and T2 gear box mechanicly putts you over 180mph ~300km/h

Or move to a taller tire, mechanincally the same change.

Ryan

HEns

i agree with more mazda, beyond that a larger turbo (more hp) should help you hit a higher max speed by the end of the 1000m

Carl Byck

A .81 Q trim PT67 will hit 500rwhp@20 psi. That or a Q trim T66, same size AR. Carl

Silver Slayer

Here are some pics of the engine:

fallenengel

i dont have any experience with 1st gens, but that aside, if you're trying to basically make a top speed dragster, you would want to put the biggest damn turbo you can fit on there since you're not at all worried about lag. Well within reason of course =). Would a t-88 or gt42 fit? That would probably put you in the 10 second class or better.

Silver Slayer

A .81 Q trim PT67 will hit 500rwhp@20 psi. That or a Q trim T66, same size AR. Carl
Tks for the info, how would a P trim with a 1.15 split housing work with a T66 front?

i dont have any experience with 1st gens, but that aside, if you're trying to basically make a top speed dragster, you would want to put the biggest damn turbo you can fit on there since you're not at all worried about lag. Well within reason of course =). Would a t-88 or gt42 fit? That would probably put you in the 10 second class or better.

I would like to go big if it would work. Whatever it is in USD converted into SAR works out 7 times more, that is why it is important for me to get the right one first. I can fit anything in the car as I do all the work myself. I don't mind abit of lag so if the T88 will work what hot side will you run? I need to make sure that I keep the car street legal as I still enjoy it 3 or 4 times a week on the road.

Carl Byck

Do you have any traction before 4th gear with those tires? If this is a top speed contest, I would look at bigger, if it is a time contest, then the PT67, I cannot imagine how any of this can be harnessed by 205 tires, even race compounds. Carl

Silver Slayer

I use a race compound but must admit I only get traction in 3rd gear. It feels like the car starts lacking hp in 4th and 5th gear. Petrol is a big problem in South Africa as we only get 102.6 octane, that's why I am limited to 20psi.

Carl Byck

Add methanol injection, run 6725-11.5 plugs. There are MANY chemicals you can add to gasoline to increase the motor octane, search "octane", and you will find the mixtures. You can use water injection instead of methanol, and not worry about seals in the motor, and fuel system(there are methanol lubricants, but I suspect it's a mediocre bandaid. You are barely touching the potential of even smallish turbos like the 67. I would be a proponent for a PT68 Q trim, if you post manifold specics, I can suggest a supplier. Then address your octane issue, and add water/meth injection. These will allow ~25+ psi easily, and an output in the 550rwhp range with much faster spool than the larger turbos. I would also make a big effort to get bigggger tires under the rear. There are many fenders available for very little money for your car that will allow up to a 315-30-16(approx) race tire. If you o[pt not to go the octane/smaller turbo/bigger tire route, you will have to go to a BIG turbo to flow the air required for the HP you need. That said, I think ultimately the first solution is the correct one, and will give you a car that works for everything, not just the "standing mile". Regards, Carl BTW Aquamist for the injection

Silver Slayer

Tks for the info, will definately go check out aquamist, and get bigger tyres for the car this week.

moremazda

iTrader: (4)

So with all of this big turbo and alcohol injection, what do you plan to do when you lay the motor on the rev limiter in 5th gear and you are only going 290kph. You should look at making the car mechanically capable of doing 300kph + before creating a turbo charged, bridge port, 4th gear tire smoking, sucking up small animals off the sidewalk as you drive by, fire breathing, boosted moster under the hood.

How does that wing do for down force?? Isn't it in the most turbulant part of the air flow that comes off of a first gen??