Larger throttle body?
02-18-2015, 01:01 AM
#1
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Larger throttle body?
Question, has anyone who is boosted swapped to a larger throttle body?
If so what sort of gains did you get from it, dynode or seat-of-the-pants?
I've been looking at the Toyota V8 throttle bodies as a possible PnP swap since they come in 65, 70, & 75mm diameters. A big increase over the stock 55mm one.
If so what sort of gains did you get from it, dynode or seat-of-the-pants?
I've been looking at the Toyota V8 throttle bodies as a possible PnP swap since they come in 65, 70, & 75mm diameters. A big increase over the stock 55mm one.
02-26-2015, 08:24 PM
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I looked through that and while it does work you have to swap the TPS sensor wires, I think the Toyota ones will just plug right in. Also discovered that for my use the 65mm is the largest I can go, so the RX-8 70mm would be a waste of money. The intake port on my supercharger is about 62mm and can't really be opened past 65mm without compromising the outer structure of the housing. Picked up a throttle body this week and it looks like I'll have to tap the fuel vapor line into the pipe going between the throttle body to the supercharger since the fitting isn't on the larger TB.
03-05-2015, 02:35 AM
#4
Does swapping to the Rx-8 help with the tune? I cant find it but i recall reading where someone said going to the larger RX-8 TB helped with some stalling around 2800-3200 RPM's? I know my tuner had some issues with my AEM FIC in that range but i could never find the info :/
03-05-2015, 07:29 PM
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Honestly I don't know. If it was stalling due to not enough air flowing into the intake manifold then yes it probably would help. I think it would only happen if the infectors were quite a bit oversized and weren't able to have the pulse cycle shortened enough to stop an over rich situation.
The problem I'm running in to is that most, if not all, of the cars that have done a larger TB are turboed and doing a blow through set-up which doesn't have as much of an issue with undersized TBs as what I'm doing with a draw through supercharged system. Draw through set-ups are much more sensitive to TB size as it can be a major restriction in getting air into the engine.
You can always try one and see. It's no more than $100 for a used TB off one of the larger Toyota engines, more if it's off the 5.7 V8, or the RX-8.
The problem I'm running in to is that most, if not all, of the cars that have done a larger TB are turboed and doing a blow through set-up which doesn't have as much of an issue with undersized TBs as what I'm doing with a draw through supercharged system. Draw through set-ups are much more sensitive to TB size as it can be a major restriction in getting air into the engine.
You can always try one and see. It's no more than $100 for a used TB off one of the larger Toyota engines, more if it's off the 5.7 V8, or the RX-8.
03-05-2015, 10:39 PM
#6
Honestly I don't know. If it was stalling due to not enough air flowing into the intake manifold then yes it probably would help. I think it would only happen if the infectors were quite a bit oversized and weren't able to have the pulse cycle shortened enough to stop an over rich situation.
The problem I'm running in to is that most, if not all, of the cars that have done a larger TB are turboed and doing a blow through set-up which doesn't have as much of an issue with undersized TBs as what I'm doing with a draw through supercharged system. Draw through set-ups are much more sensitive to TB size as it can be a major restriction in getting air into the engine.
You can always try one and see. It's no more than $100 for a used TB off one of the larger Toyota engines, more if it's off the 5.7 V8, or the RX-8.
The problem I'm running in to is that most, if not all, of the cars that have done a larger TB are turboed and doing a blow through set-up which doesn't have as much of an issue with undersized TBs as what I'm doing with a draw through supercharged system. Draw through set-ups are much more sensitive to TB size as it can be a major restriction in getting air into the engine.
You can always try one and see. It's no more than $100 for a used TB off one of the larger Toyota engines, more if it's off the 5.7 V8, or the RX-8.
03-06-2015, 04:16 PM
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03-09-2015, 05:30 AM
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lol, so many "hell no," and "don't bother" type responses on this forum lately. What happened to actually contributing to the discussion? Maybe even volunteer some information or personal experiences?
05-27-2015, 12:14 AM
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I'm not running and air-to-air intercooler, I'll be using an air-to-water setup due to space constraints. I'm going to give the 65mm a run once I have everything set up since that will keep a consistent 2.5" diameter from the intake into the inlet of the S/C body.
05-27-2015, 01:18 AM
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Doesn't matter which type of IC both still have pipes ones just way shorter.
05-27-2015, 07:59 PM
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No, mine is actually going to be built into the intake manifold. No piping at all, the output of the S/C blows directly through the heat exchanger into the intake plenum chamber and straight into the head. Similar to the stock Cobalt setup like this one, Cobalt SS Supercharged LSJ supercharger Kit Intake Manifold Injectors Brackets | eBay
05-28-2015, 12:46 AM
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In a normal set up where you buy a built intercooler yes you would. I'm not doing that.
Here this might make it a little easier to see what I'm doing.
This is my supercharger which will be mounted on the backside of the motor close to how it is pictured.
I will be making an intake manifold between the supercharger and the head. The upper half will be the plenum chamber with runners going to the head. The lower half will have the one of the heat exchangers for the air-to-water intercooler setup built into it directly in front of the output of the supercharger's rotors.
This is the core that I'm using.
It will sit across the whole opening of the S/C output. Once the air goes through the core it is in the intake manifold plenum chamber.
I guess you could consider the small space between the output of the S/C and the intake plenum as the piping but it will have a much larger cross sectional area than normal piping. If we think of it that way then yes the 'piping' of the intercooler is larger than 2.5".
Here this might make it a little easier to see what I'm doing.
This is my supercharger which will be mounted on the backside of the motor close to how it is pictured.
I will be making an intake manifold between the supercharger and the head. The upper half will be the plenum chamber with runners going to the head. The lower half will have the one of the heat exchangers for the air-to-water intercooler setup built into it directly in front of the output of the supercharger's rotors.
This is the core that I'm using.
It will sit across the whole opening of the S/C output. Once the air goes through the core it is in the intake manifold plenum chamber.
I guess you could consider the small space between the output of the S/C and the intake plenum as the piping but it will have a much larger cross sectional area than normal piping. If we think of it that way then yes the 'piping' of the intercooler is larger than 2.5".
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