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What's boost would I be making in second gear?
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TOPIC: What's boost would I be making in second gear?
#12764
What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 94
I'm making 0.5 bar now. Should it be 0.9?
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#12765
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 148
Wouldn't that depend on what you set it at?

Do you have an EBC or MBC?
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#12767
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
standard boost pressure is 0.9bar but I believe this tails off in 4th and 5th gear only. Second should boost to the same as first gear so there is something holding it back.

Someone with more knowledge of what controls the boost will advise as I would just be taking a stab in the dark

I would imagine that it could be an airflow or fuelling problem or the thingy that controls the boost pressure in the standard engine (TSV or TSVS or something like that)
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#12768
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 94
I have no boost controler. May be the boost gauge playing up. Thanks for the help.
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#12771
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 102
If your car is standard you won't get full boost in 1st & 2nd gear you will need a boost controller for that
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#12772
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
I only have a stock boost gauge in mine which are notoriously unreliable but it goes to full in 1st, 2nd and 3rd but not quite full in 4th and 5th (but I'm usually more interested in the road at high revs in 4th

There is a boost controller of sorts built into the standard engine - its not adjustable though just a safety or info system as far as I know.
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#12774
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 94
ricky2 wrote:
If your car is standard you won't get full boost in 1st & 2nd gear you will need a boost controller for that

and the winner is......ricky2.... Yea it's stock apart from a apexi induction kit and a busted hks bov. I take it it's limited in first and second to keep you from dying?
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#12776
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 102
The busted hks bov won't help refit the standard one if you still have it
Fit an after market gauge before thinking of a boost controller
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#12777
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
I did warn you I knew nothing about it

I agree with Ricky saying you should have a 'more reliable' after market gauge before changing the boost. The one in the dash isn't (apparently) that reliable. Its only useful for know if you are boosting or not.

@Ricky: what does the TSVS do? its something about vac pressure or the waste gate but I cant find the article I read before about it
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#12778
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 102
I think the rev3 system is different from the rev2.
The rev2 system has butterflys inside the inlet manafold that open,close as needed by the ecu you disconnect this when you fit a mbc,ebc.
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#12780
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 305
ricky2 wrote:
I think the rev3 system is different from the rev2.
The rev2 system has butterflys inside the inlet manafold that open,close as needed by the ecu you disconnect this when you fit a mbc,ebc.


Hey Ricky, that is called TVIS (Toyota Variable Induction System) and yes it only came on genI & II 3sgte. It was also fitted on the 4age and possibly others?. Toyota introduced it as a measure to create more torque in low rpm bands. This was as a result of their moving to multivalve heads (16valve rather than 8 in a 4 cyl).

The increased volume of available induction moved the efficiency band of the engines higher up the rev range, i.e. they breathed a lot better up top but with some loss of low down torque due to a reduction in the port intake velocity. The idea for TVIS then is that at low down RPM's the system actuates a butterfly in 4 of the intake ports to effectively reduce the size of the intake port and therefore speed up the intake velocity. Then when it get's to a preset RPM, the ECU would open the ports allowing the full charge. The TVIS plate is located between the inlet manifold and the head, but it's not affected by changing to a mbc or ebc.

I used to have a Yamaha FZR250RR it had a similar system but on the exhaust (called EXUP) whereby a valve in the exhaust would be partially closed at low rpm - causing greater backpressure and extra torque, and then it would open fully at a preset rpm, allowing my little 250 to rev out to 16,000rpm - yes no joke!

The other system you guys are talking about is TVSV (Turbo Vacuum Solenoid Valve). Basically what happens is that as your manifold pressure builds (i.e. boost), your turbo syphons off some of this pressure to the wastegate, a device which bleeds exhaust pressure from the hot side of your turbo. This is a control mechanism for your turbo to protect your engine. The wastegate has an internal spring (I guess it is .5bar or whatever the lowest Toyota pressure setting is) that governs the pressure that the turbo can spool to. Because Toyota wants to have the ability to run multiple pressures (i.e. high and low boost mode) then they have a vacuum solenoid that intercepts the pressure feed between the turbo and the wastegate actuator. This is what the TVSV is. As I understand it the factory ECU offers low boost in 1st & 2nd, and also when in limp mode (i.e. excessive knock or over boost). If you're getting low boost in high gears then it is possibly a boost leak somewhere or maybe problem with the wastegate or bov.

When fitting a manual boost controller or electronic boost controller it is typical to remove the TVSV from the boost circuit.
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Last Edit: 2010/06/24 22:47 By Quandry.
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#12782
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
I was kind of on the right lines then but is the TSVS only installed on rev3+? presumably the rev1+2 tubbs would need something similar.

How about a workshop Quandry? you could teach thicko's like me all about our engines .... second thoughts ..... a little bit of knowledge might only lead to tinkering which is prob not a great idea
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#12785
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 305
Spanky wrote:
I was kind of on the right lines then but is the TSVS only installed on rev3+? presumably the rev1+2 tubbs would need something similar.

TVSV is on all MR2's regardless of Rev. TVIS was only on Rev 1/2.

Spanky wrote:
How about a workshop Quandry? you could teach thicko's like me all about our engines .... second thoughts ..... a little bit of knowledge might only lead to tinkering which is prob not a great idea

That's the whole idea of this site to be able to share learnings, knowledge, strengths and weaknesses.

Consider this a workshop on demand format.
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If you're suffering from lag, you're either in the wrong gear or the wrong car!

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#12787
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 148
The Lord has spoken!

So it seems that your dodgy BOV is the most likely culprit based on the second last line of Quandry's explanation.

Fair play Quandry, you know this stuff at a molecular level. Impressive!
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#12790
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 305
Well if anyone else would man up and do a turbo upgrade (hint hint ) then we could have some real interesting discussions
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#12816
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
Quandry wrote:
Well if anyone else would man up and do a turbo upgrade (hint hint ) then we could have some real interesting discussions

I cant think who that might be a dig at????



Harper, I have a standard rev3 BOV. You are welcome to try it out (assuming it suits your car) if you want to see if this is the cause of your problems. From mem you are only a few miles from me so just PM me and we can meet up :th:
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#12819
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 94
Cheers spanky. I'll just buy a new ssqv. Not too worried about it to be fair. I'm in portadown where about are you?
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#12831
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
Harper wrote:
Cheers spanky. I'll just buy a new ssqv. Not too worried about it to be fair. I'm in portadown where about are you?

Just down the road in Moira. The offer's there is you want to borrow or try it before getting your new dumper.

See ya soon


Edit: you dont drive a black L reg with a scoop by any chance? have seen it about a few times, most recently at about 1:30 on the knockmore road in Lisburn today
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Last Edit: 2010/06/25 14:17 By Spanky.

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#12855
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 94
Nope. Got a black one but no scoop.
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#12860
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
wasn't you then

keep an eye out for my carib blue N reg tub .... give us a flash if you see me
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#12861
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 148
Ha! And to think you were almost offended by a wink. Well you comfy very quick Spanky, now you are ASKING for a FLASH!

Ok, joking aside, you going to do that wink mod?
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#12864
Re:What's boost would I be making in second gear? 4 Years, 2 Months ago Karma: 215
SWAGGER wrote:
Ha! And to think you were almost offended by a wink. Well you comfy very quick Spanky, now you are ASKING for a FLASH!

Ok, joking aside, you going to do that wink mod?


bit too gimmicky and not a stock item
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