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Underbody braces, turbos and more!

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PostPosted: Fri Apr 07, 2006 2:25 am 
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:silent: Recently lost the motor on my SLC; 2.8 VR6. so good time to rebuild my Suzuki! Have owned the car for several years, (2002) unfortunately the car was later involved in a collision which damaged the front passenger quarter. I have kept it garaged/covered for almost 3 years.

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:salute: Today, I have it at the shop.

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Last edited by Jacques on Tue Apr 24, 2012 7:24 pm, edited 6 times in total.

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PostPosted: Sat Apr 08, 2006 6:44 am 
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On the lift for exhaust today,. What do you recommend for diameter??
Car will be in classed for NASA Time Trials, (will replace my SLC this season) as well as DailyDriver Street car.

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about me: æ.tc


Last edited by Jacques on Tue Apr 24, 2012 7:25 pm, edited 4 times in total.

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PostPosted: Sat Apr 08, 2006 10:33 am 
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2 1/2 " from the downpipe back :twisted:
i did cat back 2 1/2" and noticed a difference.

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PostPosted: Sat Apr 08, 2006 10:56 am 
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i ran a 2 1/4" full exhaust with a high flow cat for a 6 cylinder pontiac that really worked on my mk2 turbo3. when i swapped the turbo3 to another car with a 2" exhaust i noticed a big drop in performance. the only difference between the 2 systems was the diameter of the pipe.

2 1/2" seems like overkill to me though. i'd think that exhaust gas velocity would go to nothing with a pipe that big.

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PostPosted: Sat Apr 08, 2006 12:06 pm 
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on a turbo you can go to 3" if you could physically fit it :P
you don't need the exhaust velocity for scavenging beyond the turbo, you just want the absolute least resistance. 2.5" seems to work just fine when paired up with a hi-flow cat and a resonator :)

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PostPosted: Sat Apr 08, 2006 12:26 pm 
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okay kris,

for that matter just how much wind can a turbo3 push? even with all the big mods you're doing you're only going to be pumping so much air.

the major purpose of an exhaust is to silence the engine. he lists a secondary purpose on this vehicle to be "DD" which i read to be daily driver. 2 1/4" diameter pipe is plenty big enough for a mildly tuned turbo3. IMHO anything beyond that on anything but a full out race prepped car would be wasted money and lost ground clearance.

there's a point at which the theoretical and practical applications become divergent and that point is usually the practicality of the intended use of a vehicle.

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SAAB Sonett II


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PostPosted: Sat Apr 08, 2006 1:29 pm 
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2.5" worked just fine on my t3 when it was still completely stock, the turbo made more boost, throttle response was improved, sound was great, and there was no noticeable loss in bottom end .. I know the mk2 heads don't flow quite as well, but I'm sure 2.5" would be fine for them as well.
I would test out 3" to see if there are any further gains to be had, but it doesn't suit the chassis
a 1.0L t3 pushing 200hp worth of air/fuel is no different then a 2.0L dsm pushing 200hp worth or air/fuel

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PostPosted: Sat Apr 08, 2006 1:56 pm 
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n1tr0 wrote:
...a 1.0L t3 pushing 200hp worth of air/fuel is no different then a 2.0L dsm pushing 200hp worth or air/fuel


i agree, but it's a rare turbo3 that will make 200hp. :D

the dyno sheets posted on redline for t3s run below 100hp. and there again, the practicality of a daily driven turbo3 having an engine developed to make 200hp comes into question - a race car, yeah, but a car for daily transport?

even i got the wild hair to run my vintage road racer to work on a sunny friday now and again, but daily operation of a purpose built engine would have had the law into my wallet and would have worn out an expensive power plant.

i don't give a hoot if a guy wants to run a 5" exhaust and steel barrel for an exhaust tip. the original question was posed as "what size exhaust should i run for a NASA part time racer and daily driver?"

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SAAB Sonett II


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PostPosted: Sat Apr 08, 2006 5:01 pm 
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then the answer is 2.5 deffinatly!! i have it on my daily driver. with a flowmaster on the end. no resonence, and not loud at all. but i do have the cats still . and if you are double duty on the race track, you want all you can get up high.low end only helps on the initial launch,from there its all midrange and high end.

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PostPosted: Sat Apr 08, 2006 5:46 pm 
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I'm of the school keep it in the 2" range any bigger you'll lose bottom end
if your looking for top end 2.1/4"---2.1/2" is the way to go
open up the flex joint it is 1.5/8 openiing


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PostPosted: Mon Apr 10, 2006 3:02 am 
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Many thanks :thumb2:
I've gone with all mandrel components. Flange halfway to accommodate cat, glasspack, or open exhaust.

Considering wheel offsets, :?: What range will these cars handle in stock trim?

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(L) original tyre / (R) new RT-615 Azenis Sport (200 treadwear)

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Forsa Sprint Turbo • Mirage Turbo • 914 2.0 • 914 1.8 • 914 1.7 • 924 • Corrado SLCImpreza L ·•
about me: æ.tc


Last edited by Jacques on Tue Apr 24, 2012 7:26 pm, edited 4 times in total.

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PostPosted: Mon Apr 10, 2006 5:51 pm 
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Switching to a 3" exhaust over the stocker on my DSM, I didn't lose any low end. In fact, I gained low end because of faster spooling. The traditional exhaust "rules" just don't apply to turbocharged engines.


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PostPosted: Wed Apr 12, 2006 3:25 pm 
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Jacques wrote:
... :?: What range of ETs will these cars handle in stock trim?


Hmm, nobody has experience with various backspacing and offsets, eh? Well, I have a nice set of Advan wheels collecting dust; which are +45 on a 6" wide. Ever tried to get 15x6's on a T3? :ez_smokin:

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PostPosted: Thu Apr 13, 2006 1:05 am 
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15's just don't fit on a mk1, not to mention the horrible gearing you'd end up with ...
I'm debating going large with some proxes 195/45/r14, but even that's going to require a bit of 'extra' fender rolling/flaring ...

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PostPosted: Thu Apr 13, 2006 3:35 am 
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n1tr0 wrote:
... with some proxes 195/45/r14, but even that's going to require a bit of 'extra' fender rolling/flaring ...


Actually, I just acquired a set of (5) Toyo RA1's [proxes] which I was considering for this car. I would prefer to use something a bit smaller than my 15" Azenis RT-615s, preferably 14s or 13s. ..
:?: have you tried SA22C/FB RX-7 wheels? I believe they are 114.3 as well, and can get a set of those easily (cheap) ..

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PostPosted: Mon Apr 17, 2006 1:31 pm 
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Ok, I'll get back to the wheel setup later,..

:shock: Still have some body work left to do. Here's the front section.. Bonnet and fender bolted on, temporarily . --


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about me: æ.tc


Last edited by Jacques on Tue Apr 24, 2012 7:28 pm, edited 3 times in total.

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PostPosted: Mon Apr 17, 2006 11:09 pm 
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the phone-dial rx7 wheels should work just fine, not sure which other rx7 ones will work ...
so where's the rest of the front end ?

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PostPosted: Tue Apr 18, 2006 1:34 pm 
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rarson wrote:
Switching to a 3" exhaust over the stocker on my DSM, I didn't lose any low end. In fact, I gained low end because of faster spooling. The traditional exhaust "rules" just don't apply to turbocharged engines.


Yeah, with turbos there is never any loss when you go more free flowing. Any sort of restriction simply reduces your power band across the board regardless of exhaust gas velocity.


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PostPosted: Fri Apr 28, 2006 1:58 am 
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:shock: Ok,

Here's the damage.. (Beware of graphic images, use discretion)

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Forsa Sprint Turbo • Mirage Turbo • 914 2.0 • 914 1.8 • 914 1.7 • 924 • Corrado SLCImpreza L ·•
about me: æ.tc


Last edited by Jacques on Tue Apr 24, 2012 7:36 pm, edited 4 times in total.

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PostPosted: Sat Apr 29, 2006 4:06 am 
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Donor preparation!

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about me: æ.tc


Last edited by Jacques on Wed Jan 02, 2008 2:02 pm, edited 2 times in total.

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PostPosted: Sun Apr 30, 2006 2:01 pm 
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.. Now to remove the existing damage, to accept the donor - :blackeye:

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 Post subject: Acetylene
PostPosted: Tue May 16, 2006 12:38 am 
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Ok, finally back.. :shock:

Test fitting, and welding process.

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PostPosted: Tue May 16, 2006 11:48 am 
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karma for bringing it back instead of scraping it!!! :)

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here is my sig. karma if you look

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PostPosted: Tue May 16, 2006 9:02 pm 
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tuffcarguy wrote:
karma for bringing it back instead of scraping it!!! :)

Much appreciated! The amount of time/money is well above anything I could ever recoup.


... and here's the completed (nearly) section, last pic . --

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Forsa Sprint Turbo • Mirage Turbo • 914 2.0 • 914 1.8 • 914 1.7 • 924 • Corrado SLCImpreza L ·•
about me: æ.tc


Last edited by Jacques on Wed Jan 02, 2008 2:04 pm, edited 1 time in total.

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PostPosted: Tue May 16, 2006 10:47 pm 
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Jacques wrote:
tuffcarguy wrote:
karma for bringing it back instead of scraping it!!! :)

Much appreciated! The amount of time/money is well above anything I could ever recoup.

trust me, the amount of time/money you've started to pile into it so far is only the beginning :lol:

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