lzyassmofo

hey ive been planning on doing a single turbo now for a while, but one of my friends over at stillen (a fellow 3rd gen owner) made the suggestion of being unique and going TT instead. i had my heart set on a gt35/40 but hes made me rethink everything. the only TT aftermarket X7 ive seen was that orange SX one. and from what i remember that was all custom work on the pipes and manifolds. my friend however claimes that he can get his hands on a twin turbo manifold, a very rare unit, produced by RE Amemiya, and then bolt up an hks twin gt 25/30 kit to it. he claims its feasible and that the manifold will cost 1700 bucks, and that he can get his hands on it fairly quickly. He does have a lot of hook ups with over seas exporters/importers, and one of his best friends is a very big player in this field. i dunno just a thought, an expensive one, but it might be something worth looking into. just wanted to see what you guys think. thanks guys.

oneflytrini

iTrader: (1)

son.........hook it up

cournal

go for it!!!!!!!!!

cournal

let us know

richjackson7

i am in the same boat i have a turbonetics ts04 and was going to make a single manifold for it my self but then if i sell the ts04 i can get 2 t3/t4 hybrids and go twin.

lzyassmofo

would you use a custom manifold and downpipe combo?

Beast From The East

At Checkpoint we have just finished a twin gt35/40 setup that is going on my car with a custom welded stock manifold and machined housings. The motor is also being rebuilt. If it works this will be marketed in kit form.

Of course, if you want to, you should still try with your idea - more options for the enthusiast to try!

Beast

Single7

Hi Beast from the East,

You've got my attention. Where or who is Checkpoint? When do you think you will begin building boost and actually hit full boost with that setup? Any pictures yet? More info please .--Tommy

artguy

hey all..

glad to see more people going the way of the twins..hehe

I have the m2 set which is basically two garrett gt30 ballistics...on a stock housing.

the stock housing limits how much you can push thru in terms of flow...m2 had previously ran the larger turbos (gt35's)...apparently you wont get to take advantage of the size issue if you dont machine out the exhaust manifold.....the problem lies in the fact that the exhaust manifold already cracks with high heat...a thinner machined out housing is too delicate for reliability....

Im very happy with the m2 set...they are a bit pricey but have been completely worth it....(i hate lag and a single turbo would give me that..too much of it)...the garretts also handle much higher boost than the stockers...whether that be the above set or the m2 set.

Im interested in seeing checkpoints setup..or hearing about it...what did you do differently. is it the entire turbo or just the guts? what did you do to the manifold to let the turbos flow through to their potential? I ask cuz I think those garrets are worth over 500hp each right??...but the stock manifold limits the flow to around a max of 400-405 hp..

just wondering

j

twinturborx7pete

iTrader: (3)

i'm interested.. though i have plenty of time until my twins go since they are fairly new.. i'm always in the mood to hear about adding more horsepower

lzyassmofo

hey you guys at checkpoint are over in city of industry right? i know these two guys, jeff and leo (brothers), and i think their sister's boyfriend either runs checkpoint, or works there. not quite sure what the chain of relationship is. but jeff has hooked one of my friends up, a kid with a TT supra, with some parts. i just didnt know checkpoint was a fabrication shop as well.

kundo

I just picked up my harness for my Greddy Turbo timer from Checkpoint in industry, we have an account with them. My friends cousin works there also, his name is mike.

Beast From The East

Checkpoint is on White Rock Road in Rancho Cordova, CA (part of the greater Sacramento area). They've taken down their web site and I believe they are going to revamp it.

The shop is owned by Dave and Sandy Myers. Dave was a pioneer in rotary development in the 70s - he even consulted with GM during the development of the Corvette (GM considered putting a rotary in the 'vette, but the project never got off the ground). Their main technician is Chris Green, who is in the process of trying to buy the shop from them. Chris is picking up the torch from Dave and is a die-hard racer in drag and SCCA.

Earlier posts are right in that the exhaust manifold is the greatest challange to deal with. Chris has custom welded a second wastegate by eliminating the pre-control flapper, necessitating that this new kit will be non-sequential. That's the biggest difference between this kit and the M2 kit, and M2 has been talking with Chris and they are very interested in seeing how this new kit will work. With the second wastegate we hope to reroute the hot exhaust gases that cause exhaust manifold cracks, and with the bigger turbos we hope to lower temperatures since they won't have to work as hard to get the power levels we want.

The first unit is hopefully coming in today from the shop. I post to the Big RX7 list on this topic as well as here, so look for updates in both spots.

Beast

lawn boy

Beast From The East

All -

The first unit of the hybrid twin turbos by Checkpoint Engineering arrived from the turbo sub-contractor yesterday. While the manufacture time was much longer than expected, they are beautiful and worth the wait. The welding and porting, fit and finish are top notch, as are the materials used.

These use a similar wheel setup to the M2 unit - the compressor wheel openings are about 5/16th of an inch bigger in diameter compared to stock, and the overall length from housing to housing is longer than stock by 3/8th of an inch (which was what had been originally calculated - it's nice when a plan comes together). The exhaust wheels are smaller to encourage faster spool up, and with the ball bearing design you can actually blow (with your mouth) on the compressor wheels (with a bit of force) and the wheels will turn. The flapper door for the pre-spool has been removed and the plumbing re-welded so that the pre-spool is now the second wastegate. A shunt plate and pipe to the dp is all that is needed. The wastegate doors are set to open right at 9psi (perfectly sync'ed). The oil line entrances are modified so that the oil pressure to the ball bearings is reduced to match the oil needs of the bearings - we're probably going to replace the oil lines with braided lines and proper AN fittings. Per the manufacture, each turbo is capable of supporting 400 bhp assuming you have fuel and flow to handle it. That's 800 bhp out of twins, folks. Theoretical limits are rarely reached due to practical limits, but getting to 400 rwhp on pump gas with reasonable boost levels (~15 psi) should prove out without issue. I'm hoping for low lag and fast spool up similar to the sequential system, but will the full monty of air flow. The dyno will tell the tale.

Checkpoint will be posting pictures of the new units (with the dp attached) shortly. They are in the process of redesigning their website - I'll let everyone know when they are up. My car should be completed by late next week based on workload - we're taking it straight to the dyno for tuning. I'll post dyno results on their new site as well.

More to come......

Beast

GoRacer

iTrader: (2)

What's the price?
Where's the Pics?
Where "my" set?

yy4u

any updates?

fdracer

beast update and pics on this ************ please!

Beast From The East

Ok, ok, I'm cross-posting all over on the Big List and another thread on the single turbo forum. Here's the latest:

They took pics before the install and they will put them up on a website. I don't know when and I don't know where yet. I have no influence over that.....

I have 250 miles on the car. My wideband just got finished today and I'll get that installed next week. That should work well since I'll have the needed break-in miles and I'll start dialing up the boost and tuning with the wideband for a bit, then when I get up to 12~15 psi or so I'll head over to the dyno for fine tuning and bhp numbers.

Patience, Grasshopper........

Beast

GoneSilent

can you post the pics of the turbos on the car please also.

GoRacer

iTrader: (2)

Gimme, Gimme, Gimme..NOW!!!

artguy

what was the price?

did you modify the manifold? if not you will be hard pressed to get past 400 hp. My m2s are using the garret gt30 ballistics which are rated to 400hp each as well..thats 800 hp folks...800 HP that I WILL NEVER see because of the manifold restriction. lol

just a point...good luck with the twins...Im anxious to see how you do. I should have my own dyno numbers soon as well...gotta wait for body work now that someone hit me this morning.

jason

1FooknTiteFD

BFTE, are these turbos going to be sequential or non-sequential? I'm curious and anxious to see some dyno numbers and a dyno chart.

GoRacer

iTrader: (2)

Their are supposed to be parallel, with a custom built manifold to overcome the heat problem that limits the M2's to 400hp.

ARE THEY READY YET

Beast From The East

Well, GoRacer, it's nice to see that you are paying attention to the thread (the fact that these are parallel with a moded stock manifold to overcome the heat issue). This week I will have my mandated 500 mile break-in done, and have the wideband installed. They also forgot to charge my a/c. One thing that I"m a bit excited about is that my a/c now works on all settings with my PFC! I'm wondering if the new engine wiring harness has either different and/or better wiring that overcomes the issue that the PFC's have with the a/c system.

Price - still unknown, but it won't be cheap. If you have to ask ...... well, you know how the saying goes.

How do you think I feel? Hell, I'm running around with potentially 500bhp and can't tap into it. However, time, patience, and perseverance will accomplish all things....