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Discussion Starter · #1 ·
whats the next mod to do to my Viggen folks ?

I have installed :- VRK, Hirsch suspension,rear antiroll bar, wheels...handling is now loveley

engine - Abbott ECU, ITG filter element. everything else is stock

it spins the wheels big style in 1st and 2nd, boost comes in strong in 3rd...holds just into the red on the guage...

so what next ? - Exhaust ?, I/c?, delivery/intake pipe ?...and if I do change a part how does the ECU recognise the changes ??? is this automatic...
 

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My twopences's worth.....

Exhaust (JT 3" with sport cat here or race cat here ) and performance intercooler would be good to get intake temps and EGT's down.
Likely that a reprogram of the T.7 ECU would be beneficial to allow the intercooler and exhaust additions to be fully realised....
 

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I think the first step is to read everything you can find from Trionic 7 and tuning options available out there.

You should always update your software with hardware changes by taking your car to your tuning specialist for software mapping or by bying bulk software upgrade.

If you will not ( or cant ) take your car to custom mapping, I strongly advice you byu a ready kit for your car; these include hardware required and modified T7 software mapping. By using ready kits you will get quite good results, what comes to drivability and power delivery. Do not add custom parts into your viggen without upgrading your software accordingly.

What comes to T7 tuning, there are several good companies there: 1. ) Hirsch, 2. ) Nordic and 3.) Maptun in alphabetical order. They sell ready kits for your viggen.

For 300bhp you can use your original pistons, after that it's recommended to change them to forged ones ( Wiseco, JE etc.). For 300bhp+ levels you will also need bigger turbo, like MHI td04-HL18t with 6cm2, which is compatible with your std exhaust housing.

If you will change your exhaust housing to tubular one ( quite expensive mod ), you can use many good turbos available from Garrett, IHI and KKK. Usually you will need with custom turbos also custom software, though. Tubular exhaust housing with big turbo is needed for power levels 400bhp+.

If you have unlimited budget, everything goes very easy. Just call to one of the companies mentioned, leave your car there and ask them to build your viggen for 500bhp. This will include engine rebuilding with better parts, stiffer camshafts, better fuel delivery, big fuel pump, stiffer camshafts, big exhaust system, injectors, giant turbo with good exhaust housing, separate wastegate, better clutch, modified cylinder head, coil overs, big brakes, better gearbox with limited slipp diff. etc. etc. This is the most recommended way to do it, of course.

Then you can present your viggen with 5xx bhp on some car magazine under the title: The strong Viking. Is this the american way to do it ?
 

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Originally posted by 95power:
[qb]What comes to T7 tuning, there are several good companies there: 1. ) Hirsch, 2. ) Nordic and 3.) Maptun in alphabetical order.  [/qb][/b]
In the UK we use a different alphabet
 

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Originally posted by /john:
[qb] QUOTE
Originally posted by 95power:
[qb] What comes to T7 tuning, there are several good companies there: 1. ) Hirsch, 2. ) Nordic and 3.) Maptun in alphabetical order.  [/qb][/b]
In the UK we use a different alphabet [/qb][/b][/quote]
 

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We'v ebeen down this argument before, so I won't enter in to it again, but the consensus is that you can change the exhaust without re-mapping the ECU. No, you wont get optimal results, but you will get better performance.

I would strongly recommend a limited slip diff and perhaps a change of tyres (what are you running at the mo?). The transformation in handling of the car with an LSD will be quite startling. I orignally fitted mine (admittedly to a 9000, but the principle is the same) to overcome a lack of grip in low gears and yes it does help a little, but the big eye-opener is the way it transformed high speed cornering under power. It massively reduces the understeer tendencies and makes it so much tidier. It's one of the biggest grin factors I've fitted
 

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Discussion Starter · #8 ·
Tyres - Micheal Pilot Sports on 17" rims..

They seem ok in the dry and a useless in 1 and 2nd in the wet/damp, but I susepct that more to do with my lead foot than with my tyres and a removal of boost limit in 1/2 by the ECu.

Exhausts are so damn expensive.......£700.00 plus ...even juts a rear box is £300+...
 

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Originally posted by Bubbles:
[qb]We'v ebeen down this argument before, so I won't enter in to it again, but the consensus is that you can change the exhaust without re-mapping the ECU. No, you wont get optimal results, but you will get better performance.

I would strongly recommend a limited slip diff and perhaps a change of tyres (what are you running at the mo?). The transformation in handling of the car with an LSD will be quite startling. I orignally fitted mine (admittedly to a 9000, but the principle is the same) to overcome a lack of grip in low gears and yes it does help a little, but the big eye-opener is the way it transformed high speed cornering under power. It massively reduces the understeer tendencies and makes it so much tidier. It's one of the biggest grin factors I've fitted    
 [/qb][/b]
I agree. Major problems with these FWD cars is the lack of traction, indeed.

Do you have any experiences of Racelogic's Traction control system ? I do not have TCS as std in my 9-5, and I'm searching some options for better drivability. Especially Racelogic's compatibility with T7 interests me. ( Racelogic uses ignition cut, and I think that T7 can recognize this as misfiring. Ignition cut can cause unburned fuel to flow to cat as well, which is pure poison to it )

I've tried 9-5:s with original TCS, but found out that it's not so good at all, what comes to performance issues. Racelogic system is adjustable, and offers launch control and the full throttle gearshift system. ( System can be studied on their www-site at http:www.racelogic.co.uk -> traction control ). It's not so expensive as well.

I assume that combination of limited slip differential with something like Racelogic would offer lots of benefits for fast driving with these powerful FWD cars. It's quite frustrating to utilize this kind of power with 9-5 ( excessive wheelspin )... ( I do have upgraded my car with Koni yellows / Eibach springs and polyurathane bushes, though, and car is very stable with these , but these does not offer solution to lack of grip, as we all know )

BTW, I posted this on saabnet as well, but no luck there yet... I also send an inquiry of the compatibility issues to Racelogic techical customer service, and I can publish the results here.
 

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I have the combination of tcs and lsd and I have found it quite usefull in reigning in the horsepower in the wet (and preserving the gearbox and tyres !!)

However the saab system is fairly "soft acting "
and this has two effects ..the wheels do spin a fair bit till it wakes up and the action is quite unobtrusive unless you are in WOT...
 

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Ditto.

Mine was working quite hard tonight at only 2000 rpm but was hardly noticable.

I think the 1993 on Trionic imp is better slightly better than the 91-92 DI/APC version, or maybe it the bigger and slower spooling turbo and higher gearing that helps it.

Andrew
 
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