emwmarine
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| posted on 16/9/12 at 06:31 PM |
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quote:
Originally posted by will121
I did have gsxr 600 throttle bodies with standard zetec ecu and ran fine at 150 bhp now have gsxr750 ones fitted with a home made manifold total cost
me £100. Now Running with emerald ecu when mapped dave walker did say didn't really like bike bodies but he mapped it all fine and easy with no
issues at all, I will admit proper bodies will no doubt be better and possibly more power with better air flow but cost 6 times as much or the the
price of a set of performance cams!
Do you get more power with the 750s over the 600s?
Building a Dax Rush.
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will121
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| posted on 16/9/12 at 06:49 PM |
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quote:
Originally posted by emwmarine
quote:
Originally posted by will121
I did have gsxr 600 throttle bodies with standard zetec ecu and ran fine at 150 bhp now have gsxr750 ones fitted with a home made manifold total cost
me £100. Now Running with emerald ecu when mapped dave walker did say didn't really like bike bodies but he mapped it all fine and easy with no
issues at all, I will admit proper bodies will no doubt be better and possibly more power with better air flow but cost 6 times as much or the the
price of a set of performance cams!
Do you get more power with the 750s over the 600s?
i have no direct comparison as the smaller 600's were running with standard ford ecu, when i fitted the larger 750's also fitted cams and
emerald ecu which together gave extra 23bhp (measured on two different RR's so no basis for comparison), basically would expect 750's to
ultimately provide more power but think many others have had good results with 600's fitted, think also depends on what other tuning you
propose.
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beaver34
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| posted on 16/9/12 at 07:11 PM |
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quote:
Originally posted by jeffw
There will be very little difference on WOT between any of the types of throttle body (Bike/Jenvey/ATPower etc) the difference comes on part throttle,
especially just off idle.
i agree 100%
ive run busa bodies and now run DTH jenveys
on WOT no difference, but ask the mapper what a ball ache bike bodies are to map, they need proper thorttle quadrant making for them that is suited to
a pedal setup rather than a bike grip as its hard to apply a little throttle
and 2.0 neededing 45 i would like to see 45 vs 38 on the same motor, you may make peak power but will sacrifice it elsewhere in the rev range
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BaileyPerformance
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| posted on 16/9/12 at 07:50 PM |
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quote:
Originally posted by jeffw
Interesting stuff. Was that 5BHP loss across the board or just at peak?
Just peak power, but i'm sure if we moved the injectors outboard we would have gained power over the carbs.
I tuner friend of mine built a full race 2.0L duratec for an autograss car, it made 280BHP at 9K on jenveys. He moved the injectors out (away from the
engine) and mounted them on the underside of the throttle bodies, the same engine on the same dyno made 303BHP
We have also done some work with both 2004 and 2008 Hayabusa engines for use on the grass, the 2008 engine (stock) made 195BHP (around standard power)
on jenveys with megasquirt but make 140lb/ft tq. (stock tq is around 110lb/ft)
This proves to me that the bike throttle bodies are designed with space restrictions in mind due to the limited space available on the bike. Jenveys
win hands down on a car engine and on a bike engine. This is why i think bike throttle bodies should not be used on car engines as they are barely
good enough for the bike they came off!!
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mtechmatt
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| posted on 17/9/12 at 08:16 AM |
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quote:
Originally posted by BaileyPerformance
quote:
Originally posted by mtechmatt
quote:
Originally posted by BaileyPerformance
quote:
Originally posted by monck
Thats what i did my tb's where about £70 from the US , shipping and other taxes on top of that but still good ..
On a 2.0 blacktop i would recommend 750cc or 1000cc tbs the 600 cc tb's are cheaper as theres less demand i found but ill leave that to you to
decide ..
A 2.0L Zetec must have at least 45mm bore throttle bodies, not sure what size the bike ones are? as you say the 750cc or 1000cc will prob be 45mm.
Dale,
Cant really agree with this, I have had 167bhp on 38s...
That was on CV type bike carbs (not injection)...
The ports are smaller than 45mm...
Just my opinion 
Matt
Hi Matt,
The zetec inlet ports are not massive, but overall size is close to the flow rate of a 45mm throttle (oval shaped port, about 22mm each valve
inlet)
On jenvey 45s you should see no less than 170BHP (we have seen 177BHP) on an otherwise stock blacktop, 190BHP with cams. A decent exhaust manifold and
system makes a big difference too.
It would be interesting to do a back to back with 40's verses 45's, but as there is no disadvantage to using 45's on a 2.0L there
seems little point in using 40's. On a 1.6 or 1.8 40's mite be better due to better throttle response (air speed would drop with
45's i suspect)
We have seen recently a slight drop in power when we converted a redtop from weber 45's to megasquirt and direct to head jenvey's. Better
throttle response with the jenvey's but we lost 5BHP top end. We put this down to the position of the injectors - we know from previous dyno
testing most engines respond better if the injectors are further down the inlet tract, and often mounted under the throttle bodies (upside down) also
helps power. With the carbs the fuel in introduced to the air stream roughly in the center of the carb body, unlike the jenveys we used that had the
injectors in "factory" locations very close to the engine.
Dale.
Dale,
Can conform your theroies on injectorm[placement.
On a rallyx HondaS2000 powered corsa we built, we actually had 2 sets, one near the intake face, and another set futher back. Gives more time for
atomisation/swirl at high air speeds/rpm, and anotible kick in the torque curve...
Definately the way to go if ECU/Budget/Fabrrication allows staged injection...
Matt
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