Since the quik search is down, has any one heard anything about JWT Turbo compared to Greddy and what the price would be?

 

I just called them and spoke to a sales representative. He said the kit won't be available until probably fall time. That sucks, I was hoping to get it for the summer. He said it will be in the high 6k price range, targeting 400hp. I should've asked if that was at the crank or the wheels but I forgot to ask. I'm guessing the crank. He also said they're doing the ecu with it and everything will pass emissions. He said the ecu is what they're working on now and has to be done to make the TT run properly on the car. I asked him if it will be an option to either get the twin intercoolers or one big fmic and he said there is no option. It will be twin intercoolers made to fit the stock body and they will not change it to fit aftermarket front noses. Big Ern on this board has seen the kit himself and he said it looks oem on the car. I believe on the Greddy kit certain things have to be relocated to make it fit and the front brace has to be removed ofcourse. I've heard good things about the Greddy so far.

 

Thanks for the quik reply, Ill want to see some dyno runs first.

 

Anyone have any updates ???

 

I talked to them about a month ago. The 400hp is flywheel. Since they are doing the G35 kit first the pics on their site show two ICs, but Ben also said that part of adapting the kit for the Z was to create a single FMIC.

Ben also said that they will offer ECUs for those with internal mods (read more boost!). They arn't sure how ECU upgrades will be handled yet, since its not a swap, but rather a flash.

Patience on this one. Given its got an ECU solution for fuel and timing, so it (IMO) has great potential for safe boosting.

Also, it will be the only TT kit out there with CARB certs, so no worries for us CA folks.

 

Also keep your eyes on the APS system , they are also seeking CARB approval. The APS system has better Turbos , better FMIC, , a BOV, Full fuel system and thus more power headroom.

 

Wow, I hadn't heard that APS was seeking CARB. Thats great news. From all that I have read, its a great system. I am all for choices.

Sounds like Vortec is also going to try for CARB, so the choices are increasing. We will have 2 TTs and 2 S/Cs.

Its the waiting thats killing me.

 

I bet the JWT will be the cleanest tuned system out there since it will have a pre-turbo MAF. If I recall correctly, they told me they are replacing the MAF with a larger one also.

-Charles

 

Upping the MAF size and recalibrating is certainly the "cleanest" way to approach the Emissions issues if power is limited and no BOV is used. However; The MAF really only needs to perform it's job "off boost" to meet the required emissions criteria, so "MAP during boost is most typically used". In the VQ's case blowing thru the MAF seems adequate and accounts for BOV-to-atmosphere venting. For higher boost apps, a BOV is mandatory and venting the blow off after the MAF can create richness and stalling situations

 

you can get a bov that a recirculating line that goes back into the charge pipes since the maf has alreayd measured that air coming in.

I wonder which MAF they are going to use?

 

Sure you can either add a BOV ,a Bypass or a two stage BOV/Bypass (ie. type included with the APS kit).
For low to mid boost the bypass approach is fine and also quiet. However; as the boost is upped (ie with forged bottom end and >10psi) it is a good idea to allow rapid venting to atmosphere IMO,. Under aggresive off-thottle situations (which can can lead to rich stumbles with a pre-Compressor MAF method. The JWT approach is fine for lower boot apps, just not ideal for those wanting to raise the bar much over the base configuration.

 

Got some info from JWT...they estimate completion of the G35 kit for late fall, CARB cert, ~400hp, estimated price in the upper $6k. The Z's kit estimated release early next year. Also, they have a ECU upgrade in development for the 350Z/G35.

So far it's looking good but I wish they would provide more info like APS has been doing. Price doesn't bad at all if they stick to it. I'm surprised that the Z will be release months after the coupe because there seems to be more potential Z buyers than G.

 

Yea, its wierd, JWT is being really tight-lipped about this kit.

If APS gets their CARB cert first, I may not wait.

It would be really nice to go JWT since they are about 20 minutes from me, but they are taking their sweet time with this thing.

 

I'm waiting for the JWT kit myself (for G35c). I'm guessing the ~400hp is at the crank and not at the wheels, so most likely ~340whp which isn't too bad if they keep the <$7k price.

 

Umm, not a street car, you can't pass emissions if you vent any kind of air into the atmosphere. No open wastegates or bov's. Some of us only have one car.

 

As for the MAF used they have had a good amount of success using a Cobra MAF on their SR20 turbo kits. Seems they would use this again.

 

Actually I think you have it backwards. Placing the MAF before the compressor creates less turbulence and they then recirculate the Bypas/blow-off valve back into the intake stream to AVOID a rich condition when the throttle is closed. If you vent to atmosphere on a MAF car it creates rich condition when the MAF is placed before the turbo. Also, there are MANY 400+ WHP SR20's running around with recirculated BOV's. This configuration will not limit power output on the JWT kit. I am not sure what turbo's APS is using but the JWT 530's are excellent Garrett based turbo's that will provide a ver linear power band ad will support over 500 WHP.

As for the COBRA MAF they MAY use that with a subtractor circuit to support over 500 WHP as they do in the SR20 program's. It will be interesting to see what their kit can do. They tune so conservatively to make a product that appeals to the masses and is RELIABLE, but this thing will rock and roll.

 

The turbulence mentioned depends on how far the BOV is placed away from the MAF. If the MAF is placed between the BOV and the TB and the BOV is placed far engough in advance of the MAF to avoid "wash" then the MAF can account for the loss of air flow due to BOV vneting into the atmosphere.

If the BOV is placed beteen the MAF and the TB, the MAf can not account for the loss of air mass when vented in to the atmosphere. Hence why a bypass (rather than BOV) is typically used in a MAF first system.

Personally in either case I woudl use a two stage BOV, stage one acts as bypass and stage two acts as an atmosphereic vent. Some two stagers can readily be adjusted to shift the balance bypass vs. vent. Quiet for street use responsive for track...

WRT to street legality , an interesting point is that Vortech includes a venting BOV with the SC kit and they are in the midst of CARB approval??

 

i am waiting for there kit also. i have talked with them directly as well. jwt says it will be toward the end of the year for the z's. i have installed jwts clutch/flywheel, aps big brake kit frt and rear, and recenty jwts oil pan extender and gtp volk 18's with kumhos. all in preparation. so now it is hurry up and wait!

 

I just called JWT again and asked them if they were replacing the MAF and the tech said he hasn't heard that, that is new to him he said. I also asked if the kit will come with a blow off valve and he said it will not. It will have 2 bypass valves, one for each turbo to recirculate the air. Can somebody explain to me if this is beneficial or not? I know VW 1.8T's come with bypass valves. Would a blow off valve be better and why?