I know there were a few people talking about it, but has anyone actually used a wg on a blower to make big power across power band but then cut peak HP at whatever class requirements you have?

I decided we would try it out, parts coming next week and tune is on Wednesday. I will post dyno results. Just curious about track longevity.

 

After running Na in TTC for ages I was halfway thru trying to do a turbo I found out nationals was coming to rd atl so I've been trying to get the car working on track and mapped down to TTB.

I'm not sure at all its a better idea than pulling weight and just focusing on aero and handling.
Certainly at TTC and TTB levels if you get the weight down to match the Horsepower that'd be the way to go for most tracks.
As well as corner speeds, having power/midrange TQ on a dyno plot is one thing but putting it down to the track is another issue.

Lack of tracktime and being limited to X laps per session before something doesn't look right doesn't help either.
Spending all my time at the track on the laptop looking at ecu data and starring at guages all the time on the track doesn't help.

Tuning wise the tuner had trouble pulling boost back to less than about 5psi with a log manifold even with a 1.5psi spring.
So depending on mow much boost you want to pull you might want to look at 2 wastegates or a wastegate or something on a chargepipe to dump boost.
If you wanted to go TT3 or something and do like 14psi and back down to 7psi to hit 300HP I think it'd be a lot easier to map.
I mean in TT3 you have a bunch of realy well sorted corvettes who can run a whole race distance without worrying about blowing up.

Its been done for TTC that car gave me the idea. I can't imagine what a pain in the ass it is to setup and on a momentum/handling track I'm not sure it helps if you have 200lbs more than an NA car thats working pretty good.

 

Thanks Dan, now you have me thinking maybe TT3 is a better choice given that I am more of a novice. Car hasn't been weight yet, so that's a big factor, but a fair amount has already been removed or replaced with lighter parts.

Also just to clarify, I'm talking about using a wastgate on a supercharger not a turbo, so we are talking about intake not exhaust gases.

I need to retread the class rules, but right now I'm on a 275/255 setup. Ideally I was thinking I could go as large as a 315 square, again depended on rules. I have to imagine with those wider tires in an a6 or something will put it down, obviously along with smooth inputs .

I think it's just one of those things I need to try, if it fails so be it, sell the supercharger setup and go NA, but I'm feeling very good about this setup. I went crazy on reliability parts:

Vmount setup upgrades exchanger
Dual core rad
Oil cooler
Vented but fined hood all air out
Splitter so no air in from bottom
Baffled pan/accusump
Complete fuel system redo with massive surge setup
Flex fuel to help run cooler
Lower temp tstat and super larger powerful fans
....

 

All your really doing is trying to build boost sooner...then flat line the boost plot to redline. Run the smallest pulley possible without overspinning at redline. This way you have the earliest curve you can get. Talk to dssds (i think is his username), he is doing a similiar setup to you except with a fmic. He may be able to tell you what mm wastegate you need and what spring to run.

This has been done successfully before, but i do not know what valve diameter or spring to run. Also, you will want to vent this air before the aftercooler core. This way you are not venting cooled air and possibly sacrificing having low iats. With that said youll need to relocate the blow off valve fitting to after the core. Or possible place either the wategate or bov on the sc outlet itself (i wouldnt recommend it). I would also consider upgrading to a tial 50mm valve to eliminate compressor surge on wot high rpm shifts.

The tial qr is quieter, but you may not car and opt for the noisy open atmosphere venting version. Its a lot of noise at wot high rpm shifts. I have a video of a tial on a sc v6 eclipse i built a few years back. Perfect example of the loud noise im talking about.

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You will likely have an easier time getting your car to TT3 than TTB/TTC with what you want to do. Just some info on the base tire sizes for the classes:

TTB: 265mm, TTC: 255mm, TTD: 245mm, TTE: 235mm, TTF: 215mm, TTG: 195mm, TTH: 175mm

Tire width points assessed or points credited are determined by the difference between the width of the largest tire on the vehicle and the assigned base tire size as follows:

Equal to or greater than: 10mm +1, 20mm +4, 30mm +7, 40mm +10, 50mm +13, 60mm +16, 70mm +19, 80mm +22, 90mm +25, 100mm +28, 110mm +31


Add in wanting to run A6's which are 13 points and you'd have used up all your points just on tires solely (i.e. size with compound). TT1/2/3 is done differently which can help those who have modified their cars without the thought of competition. However, the drivers who compete nationally in those classes really know how to work the rules to have some competitive cars.

 

Thanks guys. As far as WG noise, my understanding was it wouldn't be loud at all, nothing like a wg on a turbo setup, this is coming from Jeff Evans, who is building the system. He suggested a 38mm trial wg. I believe it goes right before or after the heats exchanger, but I could be wrong. Can you link me the video. My local track has a low DB limit so this could be a major issue. I couldn't stand the open wg on my turbo car, so we dumped into the Dp instead.


With all the mods already done on my car TT2 or TT3 are the only options. I think with this wg setup it can be made to be very competitive in these classes. Ideally I should be able to get around 330 tq if I cut the hp around 350 from looking at other 500hp supercharger setups. Peak tq is right around 350 hp in the 5-6 rpm range I believe.

 

I meant the blow of valve noise will be loud. Progressively the noise from the wg will get louder. Possible as loud as the bov.

If you cap the boost pressure at say 10psi, you will not obtain high torque numbers. You will have a peak hp and torque value as a 10psi non wg controlled graph near redline, except you will increase the mid range, and that is it.

This is the best i can do on my phone. If it doesnt show look up "ripp modds usdmeg" on youtube

https://www.youtube.com/watch?v=bDPI...e_gdata_player

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Well that kinda sucks. Going on dyno wed so we will see. The noise of the wg is much louder then I expected. It doesn't seem as bad as the open dump wg on a turbo but still sounds like it's taking a crapnor something. Evans says it shouldn't be loud so we'll see.

 

No, it will not be as loud as a wg on a turbo car. The video i linked is of a tial 50mm open dump bov with a vortec g-5 blower.

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I'm running a WG on a Novi 1200, it can be done. PM me if you need any specific info. There's some pictures scattered in this post: https://www.s2ki.com/s2000/topic/971...i-1200-results

I've boost limited to ~14 PSI and running a very small pulley. See top trace below: