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The mkiv Supra Owners Club

Upgrading


fisherjohn

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Blew my car at TSC3.

My fault entirely so have to live with it i am afraid, looking for a bit

of technical advice.

Car has HKS intercooler, EVC 5 boost controller but not set up.

Both cats out and HKS dragger exhaust with downpipe, a few other odds and ends but not anything that will affect perfomance.

At TSC i blew numbers 1 2 3 spark plugs as i believe thru overboosting and running lean - my fault.

At present turbotechnics rebuilding turbos as hybrids.

Number 4 piston is blown down one side / rings shagged all other

cylinders ok.

A few questions for the technical guys.

1 Would it be advisable to fit either 550 or 620 injectors and approx cost.

2 Advisable to fit 2 mm headgasket.

3 Fit walbro fuel pump or would 2 be needed.

4 Do i need to fit AVCR Controller.

5 Do i need HKS fuel rail

6 Do i need upgraded ECU and engine remapped to stop above.

7 And obviously dont thrash the car anymore without EVC being set up.

Any advice or possibly staged advice to cut down on cost and do some of this at a later date would be appreciated, turbos and piston obviously have to be done right now.

Many thanks in advance John Fisher - Both hands minus much skin at present.

01728 604033

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Guest Martin F

Hi John

 

Welcome to the BBS (I also own a Supra!!).

 

I'm assuming that your car is a jap spec as you talk about upgrading to 550cc injectors.

 

I'm not really sure why on your setup why you have ended up blowing you engine to pieces, unless there is a fault somewhere along the line or you just turned the boost up way too far.

 

Before you embark on any upgrades i think you need to give us some idea of your medium to long term plans for your car.

 

Let us know.

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Guest Terry S

Hi John & welcome to the Supra BBS.

 

As Martin said long term plans are needed.

 

If however you plan to keep the car with Hybrids, 550cc's on a stock rail will be OK. There is nothing wrong with your boost controller although newer ones are available. The Walbro pump will do just fine on Hybrids. No need for a thicker head gasket. The stock one is steel anyway.

 

You probably need to look at the type of plug you are running!

 

You could do worse than call Leon @ JPS Motorsport for a chat. 01908 367100

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I would take a guess at being a J-spec with no cats and a flat out 1.5 mile run would have been the culprit...

 

Do you have a boost gauge? - Or better an EGT gauge? - What were the readings?

 

IMO, you're at the point where fueling is definatly the next thing to sort out, (other than reparing what's broke!)...

 

There's loads of info on here regarding fuelling and injectors... Have a play with the search button and wait for someone that knows more about this kind of thing... :)

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Guest Martin F
Originally posted by Matt Harwood

Have a play with the search button and wait for someone that knows more about this kind of thing... :)

 

It's broken, i tell you it's broken.

 

 

 

:moo:

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Originally posted by fisherjohn

Car has HKS intercooler, EVC 5 boost controller but not set up.

Both cats out and HKS dragger exhaust with downpipe, a few other odds and ends but not anything that will affect perfomance.

 

Hi John,

 

Sorry to hear of your mishap. These cars are so strong but I wondered how long it would be before I start to hear of them going pop, especially quite spectacularly like yours. Thats 2 now in as many weeks that I've heard of and I fear it'll only get worse as more people play with them when they don't have the know-how.

 

You need to decide how much bhp you want before you will get any real advice. As Terry says, 550's are fine for stock based turbos but will you be happy with a max of 420bhp or so? If you want more then now is the time to sort it out. How much boost do you want to run? It's possible you will need to put a cat back in or run a restrictor with your current setup.

 

I'm presuming all of this was done recently going by the fact you have an EVC-5?

 

If you just want to get moving then I would fit 550's, on the stock rail, with an Apexi Super AFC to trim the fuelling down. You don't need an AVC-R; that is a boost controller like your EVC-5.

 

Fit OE replacement engine internals, including the head gasket. Fit a new Walbro pump. Fit some decent spark plugs. HKS S40i's IMO.

 

Most importantly, get the thing setup and checked by someone who knows what they are doing.

 

Let me know if we can help.

 

Regards,

 

Nathan

TDI PLC

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Hi John after I spoke to you at the weekend I popped in to see Leon and told him about your mishap he agreed that 550s on a stock rail would be ok for the hybrids along with the walbro pump !

I said the thicker head gasket would only really be needed if you decided to go the whole hog on the engine rebuild and go for the full forged bottom end but that would be over kill on hybrids, if how ever you are going to go for a single then it would be aswell to get it done while its all striped down.

If it was me I think I would get the head ported/polished and bigger (264?) cams they would complement the hybrids well ! Leon did say to give him a ring if you want to know more 01908 367100 !

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Originally posted by Martin F

Hi John

 

Welcome to the BBS (I also own a Supra!!).

 

 

Oi! I know John so pack it in! You and your bloody cattyness! :p :sly:

 

I just got a pump off of CW for £160+vat not sire of the actual specs but he said it would be good enough for anything using stock based turbos.

 

Either the GReddy E-manage or S-AFC from Apex'i will sort out your fueling...the e-manage will handle timing adjustments too!

 

Glad to hear you're getting sorted...thought the compression no.s were low! :eek: :(

 

If you want to have the capacity for a bigger turbo later on, you might as well fit the good stuff now and get the cost out of the way. If not 550's will be fine. If you get high impedance ones you won't have to have the wiring loom...if you get UK spec low impedance ones you will have to modify the wiring. There is an FAQ on how to do this.

 

No doubt speak to you later...

 

Cheers

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Thanks - Martin, Terry, Matt, Nathan, Alex, Mark.

Car is J spec, Automatic.

Object to bring motor up to approx 500 bhp no more.

By the way the car had brand new HKS 40i Plugs fitted when it blew, still think it was a case of overboosting and running lean.

From info rcvd think i will follow the below scenario.

 

1 Walbro fuel pump from CW

2 Injectors 550 with high impedance - where can i obtain these from anyone.

3 G Reddy E manage AFC - again where can i obtain.

4 Piston and rings - OE Replacement - again where can i obtain.

 

Turbos are being machined and transformed by turbotechnics at present.

 

Once car is back together will need someone who can fit AFC and set it up, also need to set my EVC 5 boost controller, generally set up the car when it is back running so i don't spend half my leave repairing the car in future.

At present have car ready to lift out the engine and remove the piston.

 

Last question what is the normal compression readings for a supra as my mate who is a mechanic of some 35 yrs got readings on all cylinders except number 4 of between 80/90 psi.

Rgds

JLF

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Guest Terry S

John there is a company called Power R in Japan that sell high impedence injectors. I also think Blitz do them.

 

SAFC you can get pretty much anywhere now.

 

Leon can rebuild your bottom end & has done a few other memebers including my own. He can also set up your boost controller.

 

I *think* average compression for a MKIV is between 140 -160 although I have never taken readings personally on a MKIV.

 

Best of luck.

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iirc compression should be 156 or higher with a difference of not more than 10% between cylinders. my cars have been:- car 1 with 80k approx average 175 psi, car2 with 18k approx average 182 psi (lowest 180 highest 185).

 

the numbers u got r dreadful :(

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I've got a contact for the E-manage (why does everyone want to use the ugly S-AFC? :innocent: )...I'll try to speak to him about it. As Terry says, Power R or in the states there is http://www.RCeng.com for the injectors.

 

It's dawned on me what happened to your car. John, you spend a lot of time out at sea don't you. The car during those ~6months doesn't get thrashed. I would guess there fore all the blame lies with your injectors they are probably choked up with residue, they probably need to be ultrasonically cleaned.

 

This means that you can do all the mods you like but if you leave it for 6 months again it will happen again.

 

Guys any idea's on how to prevent the buildup of residue in the injectors??? Assuming that is the cause.

 

Also, John before buying OE replacement pistons and rings it might be worth while seeing what kits are available with lighter, tougher parts. OE is always very expensive, the price of replacements from someone like JE might not be so bad. Leon has experience with JE Pistons you might want to discuss the options with him.

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Alex - I'm just about to order some JE pistons for mine and they're about 50-60% more than Toyota pistons. Is the E-manage "plug-n-play" for the MkIV? We have to do all sorts of electronic conjuring tricks to make it work on the Mk3!

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Guest Terry S

Leon has just fitted an e-manage to a MKIV so maybe call him for info.

 

Alex *if* it is residue in the injectors John could run a mix of Toluene through the tank that should clean them up prior to a thrash.

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Originally posted by Adam Wootten

Alex - I'm just about to order some JE pistons for mine and they're about 50-60% more than Toyota pistons.

 

Blimey, that's a first for an OEM part!!! :D

Though yours are for a MKIII....

 

PHR site has....

 

PHR Forged Pistons by J&E. These custom forged aluminum piston sets are available in bore sizes from 86mm to 87.5mm (.020" to .060" over standard) and any compression ratio desired. Constructed to PHR specifications with larger and deeper valve pockets, increased oiling capacity, thicker reinforced piston crown, and revised ring positioning for more durable operation in extreme horsepower applications. Includes six custom tool steel wrist pins and pin clips. Price: $999.00 set of 6.

 

J&E Standard Forged Pistons. Manufactured by the top name in aftermarket pistons, these J&E forged aluminum pistons are available only in 86.5mm bore size (.020" over standard) with 8.5:1 compression ratio. Includes standard wrist pins and pin clips. Price: $799.00 set 6.

 

Total Seal Piston Ring Set. For use with PHR forged piston set only. Features a proprietary top ring material, gapless second ring, and 4mm oil control ring set. Price: $179.00 set.

 

Total Seal Piston Ring Set. For use with standard J&E piston set only. Features the standard moly top ring, gapped second ring, and 2.5mm oil control ring set. Price: $150.00 set.

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Yep, same price as for the Mk3. It's our arse-backwards ignition system which gives problems with the e-manage, the fuel mapping works just fine. I'm glad Leon has trained himself up on the thing already, that means I won't have to pay for his learning curve if I go to him to map the thing (if I buy one :D )

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