wattup wit da turbo?

105

Asked by Aug 24, 2008 at 09:32 PM about the Mazda RX-8

Question type: Car Customization

Im helping my friend Dwayne build his RX8 n he just installed a Greddy turbo. Its only 6 pounds of boost but then we encountered problems with the air-fuel mixture, especially over 7000 revs. Wat gives?

7 Answers

315

time for a re-tune on a dyno. take it to a local speed shop that has a dyno and have them dyno tune it.

8,325

In addition to a cpu flash, you may need to beef up the fueling system... I'm not sure if you've thought much about it, but 6 psi is on top of atmospheric pressure... 6 psi doesn't seem like a lot but that's 40% more pressure in the same space... means you need ~40% more fuel, if you can keep intake temperature down... PV=nRT... It sounds like you may just be starving the engine... I'm sure there is more information to be had on a rotary fan forum of sorts.

105

So how about if we get bigger fuel injectors?

155

you should tune the e-Manage that came with your turbo system if you havn't yet im pretty sure all GReddy turbo systems come with it dont know much on the rx-8 but the guy above could be right too

315

u can do that but ur still going to need a tune... personally i'd tune it first if they say its getting starved then yes i would most def. Any local speed shop should be able to hook up a air/fuel meter to read it after they tune it. but if u get bigger injectors you also will need to look into getting a fuel pump that can supply the new demand to the injectors. I'd take it to a speed shop that u think you can trust and that does work on imports such as those. a tune should be roughly anywhere from $400-$500 depending on the shop.

1 of 1 people found this helpful.
105

could any of the problems have 2 do with the RENESIS motor itself, like for example the exess compression due the certain revisions made by Mazda (e.g. the side intake port)?

315

im not all that well knowledged in rotary motors myself... well practically any imports, but its possible compression has to do a big part in air to fuel. when you up the compression in the motor with air u also need to bring in more fuel to match with it. i mean when it comes down to air and fuel thats something that should be left to guys who have the experience and tools to read it properly and tune it. i dont even mess with my fuel map myself. There's alot of risk in it you burn to lean u can put a hole in a piston, if u burn to rich u just waiste gas and horsepower, general rule of thumb its always better to burn rich then lean.

Your Answer

Add photo

Related Questions

RX-8

Looking for a Used RX-8 in your area?

CarGurus has 360 nationwide RX-8 listings starting at $1,299.

ZIP:

Search Mazda RX-8 Questions

Mazda RX-8 Experts

#1 tennisshoes
tennisshoes
Reputation 200
#2 Paul Wilson
Paul Wilson
Reputation 180
#3 Michael Kane
Michael Kane
Reputation 150
View All

Related Models For Sale

Used Nissan 350Z
52 Great Deals out of 1,206 listings starting at $2,899
Used Ford Mustang
543 Great Deals out of 45,845 listings starting at $1,999
Used Mazda RX-7
64 listings
Used Mazda MX-5 Miata
43 Great Deals out of 3,935 listings starting at $2,985
Used Chevrolet Camaro
244 Great Deals out of 31,194 listings starting at $369
Used Mazda MAZDA3
283 Great Deals out of 32,563 listings starting at $1,300
Used BMW 3 Series
941 Great Deals out of 30,258 listings starting at $1,000
Used Honda Civic
814 Great Deals out of 88,107 listings starting at $1,299
Used INFINITI G35
86 Great Deals out of 3,186 listings starting at $2,000
Used Scion FR-S
21 Great Deals out of 930 listings starting at $10,998
Used Nissan 370Z
60 Great Deals out of 2,882 listings starting at $11,995
Used Mitsubishi Lancer Evolution
17 Great Deals out of 495 listings starting at $13,998
Used Dodge Challenger
211 Great Deals out of 23,433 listings starting at $7,990
Used Dodge Charger
454 Great Deals out of 29,324 listings starting at $2,300
Used Subaru Impreza WRX
47 Great Deals out of 1,277 listings starting at $3,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.