Did the TTC mod on my Supra, noticed a few things, need some help

[Guest supra&starlet]

first off here are the specs of my vehicle

 

1993 JDM Supra Twin Turbo 6 speed

 

Aristo CT20A turbo's (replaced them my self)

 

Autobahn 88 Downpipe

 

Apexi Full exhaust system (no cat's)

 

Mines Tuned ECU (Boost cut removed, Rev limit increased, advanced maps, fuel cut removed, may/may not have boost increased)

 

Blitz intercooler

 

 

Anyways so the other day was having some issues with my car in sequential mode. I decided to switch her over to TTC mode using the 5 minute conversion, worked flawlessly and car runs great

 

The car had a shitty HKS EVC 4 that i removed

 

The car now in TTC mode boosts to approximately 0.9 BAR of boost. Sometimes i noticed when i floor it at about 3500rpms the boost spikes a bit to 1BAR then comes back down to approximately 0.9BAR and it sits at approximately 0.9BAR all the way to redline. Car pulls like a freight train. When i changed the turbo's i put the same old gaskets on the down pipe and i cant remember if it had the restrictor gasket like it should or not, they all looked brand new to me, so i didnt find the need to replace them so i put them back in. I am a little bit of noob when it comes to this, but is what my car is doing regarding boost wise safe?? Will i blow anything up? Is there something wrong with it ? Should it be boosting this high with no boost controller?

[listy]

If it's boosting to 0.9/1 bar then you should be safe. 1.2 bar is the recognised safe limit for JSpec Supra turbos, but I can't comment on the Aristo ones, I'd imagine they'd be about the same

[Guest supra&starlet]

also another thing that i noticed. My friend he have same car as me except his is BPU automatic

 

He did a pull video from 100km/hr to 180km/hr and i did the same video and my car did that same speed about 2 seconds faster than his car, and his car is running about 1.1 bar of boost. Does this mean that my boost gauge could be pointing wrong or??

[Guest supra&starlet]

also another thing that i noticed. My friend he have same car as me except his is BPU automatic

 

He did a pull video from 100km/hr to 180km/hr and i did the same video and my car did that same speed about 2 seconds faster than his car, and his car is running about 1.1 bar of boost. Does this mean that my boost gauge could be pointing wrong or??

[TubbyTwo]

what boost controller are you running then?

 

You need something to ensure you have stable accurate boost control. What happens when the air gets colder or hotter??? Its going to be all over the place.

Edited February 22, 2014 by TubbyTwo (see edit history)

[Ian C]

The car now in TTC mode boosts to approximately 0.9 BAR of boost. Sometimes i noticed when i floor it at about 3500rpms the boost spikes a bit to 1BAR then comes back down to approximately 0.9BAR and it sits at approximately 0.9BAR all the way to redline.

 

It'll probably be spiking to more than that. It's a known problem with the basic TTC setup, and the higher the gear you're in when you pass through 3500rpm, the higher the spike.

 

Car pulls like a freight train. When i changed the turbo's i put the same old gaskets on the down pipe and i cant remember if it had the restrictor gasket like it should or not, they all looked brand new to me, so i didnt find the need to replace them so i put them back in. I am a little bit of noob when it comes to this, but is what my car is doing regarding boost wise safe?? Will i blow anything up? Is there something wrong with it ? Should it be boosting this high with no boost controller?

 

It sounds like you're talking about a restrictor ring, which isn't a gasket and usually sits between the centre pipe and the back box pipe of the exhaust system as that's the easiest place to fit it

 

A boost controller can only increase boost from your minimum boost levels normally, but in this case it would be very useful as it can control boost below 3500rpm and stop that nasty spike. It spikes because the stock boost control isn't used until 4000rpm as before that the sequential system control s boost on the first turbo by prespooling the second turbo with excess exhaust.

[Guest supra&starlet]

thanks for the replies.

 

So in this case what should i do? Should i purchase a manual boost controller and set it to 0.9BAR or??? Right now the car does not have a manual boost controller, however the mines ecu tune some of them are known to have boost increase, i am not sure what to do

[TubbyTwo]

Refit the hks evc and set it up correctly.

[mellonman]

Im not even sure you have a problem 0.9 is very safe boost most run 1.2 over here with no issues, if you worried about blowing things up then dont cos a 0.9 nothing is going to blow, but you should really put it back to stock sequential instead on the TTC with is rubish unless you have a mapped piggy/stand alone ecu

[Guest supra&starlet]

i have a mapped and tuned stock ecu

 

It was tuned by Mines

 

And what should i do about the boost spike when i first get on it. Is there any threads that properly explain how to hook up HKS EVC 4 boost controller to the car? Because using HKS's intructions they are no use for a supra. The unit is hooked up electronically i mean it lights up and works it just doesnt control boost, ineed to know where i hook up the vacumn hoses in the engine bay so it can indeed control the boost

[Swampy442]

thanks for the replies.

 

So in this case what should i do?

 

You should test and replace the VSV/VSVs that are causing the problem with the sequential system. TTC mode is just masking the problem. If you want to stay TTC then, as Ian said, a man who knows a lot about these things, set the boost controller up properly to help control the spike.

[mellonman]

i have a mapped and tuned stock ecu

 

It was tuned by Mines

 

And what should i do about the boost spike when i first get on it. Is there any threads that properly explain how to hook up HKS EVC 4 boost controller to the car? Because using HKS's intructions they are no use for a supra. The unit is hooked up electronically i mean it lights up and works it just doesnt control boost, ineed to know where i hook up the vacumn hoses in the engine bay so it can indeed control the boost

 

So you had your car remapped for the TTC modification by mines, how much did the remap cost you?

The normal mines ecu is mapped for the sequential system by the way

[Swampy442]

So you had your car remapped for the TTC modification by mines, how much did the remap cost you?

The normal mines ecu is mapped for the sequential system by the way

 

I guess the car either came with a MiNES or he bought it to fit.

[Guest supra&starlet]

the car came with the mines tuned ecu when i got it, and it came like that from japan too, is there any instructions with pictures of hooking up an HKS evc boost controller on the forum??

[mellonman]

Your ecu will not be mapped for TTC, there will be no power gains and your wasting your time

[MK2]

Send your ecu number to mines. They can exactly see what is done to the ecu.

Mines does not offer an of the shelf ecu. When buying one of those you have to give them the exact spec of you're car: like cams, type of fuel, size of injectors etc etc.

 

None of the mines ecu's are exactly the same, they are tuned seperately for every customer. So if it came in sequential it will be mapped for sequential, just like Mellonman said.

[Swampy442]

Send your ecu number to mines. They can exactly see what is done to the ecu.

Mines does not offer an of the shelf ecu. When buying one of those you have to give them the exact spec of you're car: like cams, type of fuel, size of injectors etc etc.

 

None of the mines ecu's are exactly the same, they are tuned seperately for every customer. So if it came in sequential it will be mapped for sequential, just like Mellonman said.

 

No dude, MiNES do offer generic ECUs, they also offer a bespoke tuning service. Behold

 

http://www.mines-wave.com/E_09/CATALOG/E_ECU_TOYOTA_E.html

[MK2]

That's quite the opposite from what Mines Europe told me. Thanks for the extra info.

Edited March 2, 2014 by MK2 (see edit history)

[Guest supra&starlet]

I have emailed mines a long time ago, i gave them the serial number off the ecu, they got back to me and said they needed a picture of the plaque, i send them the picture, they never replied to me to this day. And i am not sure in what mode the car came from japan. One thing is for sure, i have to do something to stop this boost spike, and i am not quite sure what to do about my boost spike at all. As in sequencial mode, the car boosts to 0.3 BAR only with first turbo then when second turbo comes online in sequential it boosts to 0.8BAR. So there is something wrong with sequencial because first turbo does not create full boost

[Homer]

Something is definitely wrong then. The first turbo should make around 0.45 bar and the second should take it to 0.76 when it's stock. BPU'd it should easily make 0.7 bar on the 1st and 1.2 with the 2nd (unrestricted they will go to 1.7 bar!). It could be a damaged 1st turbo or a VSV or EGBV issue like others have said. I'd definitely be checking your VSV operation and that the actuators are functioning correctly. It's a bit of a pain with the stock system as everything is tucked away, one fairly simple thing to do is to remove the compressor housing on the 1st turbo and inspect the clades for damage. Damaged compressor blades are very common on the 1st turbo.

[Guest supra&starlet]

Something is definitely wrong then. The first turbo should make around 0.45 bar and the second should take it to 0.76 when it's stock. BPU'd it should easily make 0.7 bar on the 1st and 1.2 with the 2nd (unrestricted they will go to 1.7 bar!). It could be a damaged 1st turbo or a VSV or EGBV issue like others have said. I'd definitely be checking your VSV operation and that the actuators are functioning correctly. It's a bit of a pain with the stock system as everything is tucked away, one fairly simple thing to do is to remove the compressor housing on the 1st turbo and inspect the clades for damage. Damaged compressor blades are very common on the 1st turbo.

 

i just replaced the turbo's not too long ago with a fresher pair of low mileage aristo ct20a turbo's. I had the intake off the first turbo about 1 month ago and the blades were perfectly intact just like when i first put the turbo's in, i do have in my basement another vsv sensor that came with the turbo's so i will install those in to see what happens

[Homer]

That rules out the turbo's so it's likely to be an issue with VSV's or "something else". What exhaust system is installed and are there any cats present? As mentioned above the whole idea behind controlling boost on the JDM engine is exhaust restriction, assuming all is working well with the various sequential system there's nothing else that keeps it from running huge boost without it. Perhaps try removing the restrictor ring and doing a very quick run unrestricted and see what boost you see (assuming you trust your gauge!). If it's truly unrestricted it will run way past 1.4 bar in any gear. Not recommended of course but if you are careful you should be able to quickly see if it can ran up to at least 1.2 bar.

[Guest supra&starlet]

The car does not have any Cat's present on it

 

-Autobahn 88 Downpipe

 

-Apexi Midpipe

 

-Apexi Catback

 

And the aristo turbo's came with the VSV Sensors and all that, but i did not use them, i just used the old VSV sensors that were on the car already. And i am not sure i trust the gauge or not. because here is the thing.

 

It is an Electronic HKS digital boost gauge, and i have the vacumn hose routed to the manifold pressure, and that follows back and hooks up to this Round Metal ball that has a electrical connector that goes to the back of the gauge. So i am not sure how accurate it is, but i would have to guess that it is fairly accurate?

[Guest supra&starlet]

Also, when the car is in Sequencial mode, with the following mods i have, given there is no boost controller whatsoever present on the car what should it be boosting at? I will change the VSV and all of the electronic sensors that are beside the alternator on the first turbo, then i will put the car back in sequencial mode and do a 3rd gear pull to see what it is boosting at, but i first need to know what it should be boosting at so i know what to expect

[Benjy]

Full boost, TTC or sequential should be 1.2 bar max