Quote:
Originally Posted by warmkop
Okay,what is the plan wat do you suggest
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Step 1 - Define your Goal(s):
What do you ultimately want to achieve? A 10 second pass? OR 1000rwhp? Either one of these is an acceptable goal, but there's no need to try to do both at the same time, unless you're sure you want to expend time and money to get both of these.
Please note that 1000rwhp is a more specific (and expensive) goal. Since it's so specific (horsepower only), we could achieve this and your Supra wouldn't necessarily be any faster. For example, without wider rear rims and much better rubber, all 1000rwhp buys you is a slow car that does a great smokeshow. Keep in mind this is just an example to illustrate why the modifications that end up on the plan have to be considered all together at once, as a complete system, in order to keep your Supra safe, reliable,
and achieve the goal of the redesign.
In one of your posts, you said your goal is "drag racing and roadrace". Is this still accurate? ...or in another of your posts, you said "I decided to build the supra for the dragstrip". If you're still interested in roadracing, what are your goals for this? Is there a particular track you plan to roadrace on? Keep in mind large turbos and high boost is terrible for roadracing. Drag racing tires are also terrible for roadracing. For roadracing, you don't need more than about 550rwhp VERY reliable, good brake pads, brake ducts, roadrace tires, and good suspension. Many of these modifications are exactly opposite of what you want for drag racing. Building one car that can do both will be quite expensive. ..or are you sure you want to modify your Supra for drag racing
at the possible loss of its ability to be roadraced and handle well in cornering? - is that your final decision? I'm just trying to clarify and be completely sure.
I also need to know if you want to be daily-driving this car...or at the very least if you want to take it out on weekends and drive on the street (around town). If not, are you willing to keep your Supra on a trailer in between track events? I don't mind helping you build a
track-only trailered Mkiv Supra Turbo, but I have to know that's what we're doing ahead of time. Eg. with a trailered car we can run biased-ply drag slicks with skinnies up front, remove the rear brakes, put in a parachute, and weld the rear axle solid. On car driven on the street, these modifications are impractical.
Are there any other goals? Do you also want to maintain
any the Toyota design of having a car that's good for taking corners (roadracing/autocross/etc.)? What about top speed? Do you care if we limit that? All of these are considerations. I need to know as much as possible about everything that you want to do with this car, *before* we start buying parts and turning wrenches.
Whatever the goal(s) is/are please be prepared to commit to them absolutely...and do your best to eliminate all preconceived notions about how to achieve that/those goals with any one techology (eg. single turbo, fuel system, etc.) After we get your goal(s) set in stone, then we can find the least expensive and most reliable way to achieve it/them.
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Step 2 - Clearly define our starting point for the modifications:
The Mkiv Supra Turbo is a symphony of systems working together - we have to consider the impact of each change on the entire operation of the car - from suspension and weight balance, to traction and cornering, to engine longevity, to braking performance, convenience, maintenance, etc., etc. That's the only way to modify it and have the result be safe and reliable.
Please let me know the complete list of *everything* that has already been done to your Mkiv Supra Turbo. Is it currently driveable? Specifically, what problems are/were you having with the oem twins? To me, we should troubleshoot this problem first so we know we're starting with a good base. Also, 150psi is actually
not a "good" compression test result. A new 2jz-gte actually compression tests over 170psi. I'd suggest we do a leakdown test on your engine to verify our starting point.
Has it already been modified to accept the fuel cell? Have you removed the oem fuel system yet? Have you removed the oem clutch yet? Have you installed that 'godspeed t4" 67mm turbo kit yet? ...or have you not purchased a turbo yet? (two of your posts have conflicting information). Have you already installed the "gotech pro x"? etc. What other parts have you purchased that have not been installed yet? I need to know exactly what we have as a starting point. If you have any pictures you can post, that would be good too.
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Please answer each and every one of these questions, in both sections above, as thoroughly and completely as possible so that I can provide you with accurate advice. Again, my goal is to keep your Supra safe and reliable, and to only recommend modifications that are absolutely necessary for you to achieve your goal(s). This approach will save you time and money, and will allow you to achieve your performance goals as quickly as possible so you can start enjoying your Supra sooner!