When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Okay so this is almost a two part thing. On my last thread I pointed out how I am only making 10 pounds of boost with a 15% pulley & 2% overdrive crank pulley. 10lbs on that setup is pretty low imo and I remember at least 6 months ago topping out at 15lbs of boost at WOT. Also I have been chasing a P1498 code (unmetered air after compressor) which I assume had something to do with this issue. I for the life of me could not find and loose, torn , or cracked vacuum hoses. A DIY smoke test turned up nothing also. Somewhere on an old thread someone mentioned their crank pulley degrading causing this issue but I threw out that possibility because I have never heard of an Alta pulley going bad. Someone commented on my last thread to grab ether based starter fluid and spray around looking for the leak. 2 cans of 50% ether starter fluid later and nothing caused a change in rpm on the vehicle. So now lets jump into what I did today which solved my issues (I HOPE). I bought a set of Audi injectors from FCP EURO which were recommended by AdrianCL (Sorry Im not as advanced as a-lot of other people on this forum so I don't know how to tag adrians username)
I will provide pictures of the injector part # so you can order. They are direct replacement plug and play and I think they are 375cc.
Okay so heres what I did. I replaced the injectors and while doing so checked alot of the vacuum lines. I also replaced the bypass valve which I believe to be the culprit in this situation. I replaced the bypass valve with a Detroit tuned one. My old one was very very easy to push in but it would also spring back. But what I think was happening is the bypass valve wasn't closing all the way and the engine was sucking in air through the bypass valve at low rpms and idle causing my “unmetered air after compressor” (the bypass valve is after the compressor). After the install and re assembly of everything and clearing the codes no more surging idle and no more CEL even after a hard drive.
THE BEST PART BEING THAT ON THAT DRIVE I PEAKED AT 15PSI AGAIN! I can tell the car will need a tune but the ecu can adjust for most of the fuel.
I bought a set of Audi injectors from FCP EURO which were recommended by AdrianCL, I will provide pictures of the injector part # so you can order. They are direct replacement plug and play and I think they are 375cc.
Now get Adrian to tune it and you'll see even more performance. Also, if you're not running with a CAI, get one that is sealed by the hood closure and draws air from the vents below the windshield.
Now get Adrian to tune it and you'll see even more performance. Also, if you're not running with a CAI, get one that is sealed by the hood closure and draws air from the vents below the windshield.
He will be tuning it very soon. I am going to do the 19% pulley that I have from WMW and I do have an Alta air intake. It has a box around it but im not sure how well it seals.
That ebay ic is still robbing I'm willing to bet 3lb of max psi
I also HIGHLY HIGHLY suggest if you decide to tune it , have adriancl tune it..the guys done absolutely wonders on my personal car along with multiple of my freinds minis.
or if u plan to stay on 380cc , mrblah sells programmed facelift ecu ( if your is pre 05') and its pkug n play after he uploads your vin and you can choose from either a stock , jcw OR GP tune..i HAVE that setup in my other mini and it's runs great too.. a littttttttle lean but definitely not near the danger zone. The gp tune runs abit more timing , redline and 380cc
Last edited by MiniManAdam; Oct 29, 2023 at 01:09 PM.
That ebay ic is still robbing I'm willing to bet 3lb of max psi
I also HIGHLY HIGHLY suggest if you decide to tune it , have adriancl tune it..the guys done absolutely wonders on my personal car along with multiple of my freinds minis.
I will have adrian tune. For sure. Already spoke to him a few weeks ago just getting all the mods on because I dont want to have to tune multiple times. Next is 19% pulley with a fresh belt of course. Im also trying to stomach the cost of the grs intercooler. I did get a code today though P0172 bank 1 too rich. Im sure because of the injectors. I think the tune will clean this up. Also my car is an 05.
Nice set-up and complimenting mods btw.
I must've misunderstood you in your previous discussion/thread - I was under the impression that you were gaugeless.
Those gauges look mighty cool I should say!
Nice set-up and complimenting mods btw.
I must've misunderstood you in your previous discussion/thread - I was under the impression that you were gaugeless.
Those gauges look mighty cool I should say!
Thank you very much! Everything is still a work in progress. I guess like everyone elses build lol. Something can always be better.
Thank you very much! Everything is still a work in progress. I guess like everyone elses build lol. Something can always be better.
don't overlook a stock ic man.. you don't need an upgraded ic until youve got an aftermarket sc.. truuuuuuuust me.. the grs still wouldn't net you a power gain v a stock ic , though it be far far better than an ebay. Even on 100'F , sunny days , the stock ic on my setup is JUST fine. I too run a 19% and have never understood why anybody runs anything less when its a street car and theyre looking fir most power they can get $ for $... too long a misconception floated around that a 19% couldnt safely ve run but after calculations and full testing , it spins the waterpump like 120rpm more than a 17% , cause 0 coolant clevation ( always laughed at that one ) and doesn't overspon the sc beyond its capabilities either.
My mods are:
Ported 06' facelift supercharger fully serviced befor install with 19% pulley and new tensioner ( 19psi) .ported n polished sneedspeed intake Manifold and both side intercooler horns are ported and polished
.msd coilpack and msd wires and step colder ngkR plugs .380cc jcw injectors
.340lph fuelpump and new filter and cleaned the tank too. .ported throttlebody, intake and heatshielding .Xforce catless 421 headers with wideband bung . 2006 mcs facelift ecu with factory GP tune uploaded
makes peak 18psi but it barely sees that so lets call it 17psi.
Just scoop a used stocker for 40$ , you got nothing to loose man , i promise.
don't overlook a stock ic man.. you don't need an upgraded ic until youve got an aftermarket sc.. truuuuuuuust me..
Im going to trust you on this one and report my findings. Im ordering a stock jcw ic on ebay right now. 40 plus 20 shipping. Lets see if I can peak over 15psi WOT on that setup. Il even record a before and after. Lets settle this for sure.
Im going to trust you on this one and report my findings. Im ordering a stock jcw ic on ebay right now. 40 plus 20 shipping. Lets see if I can peak over 15psi WOT on that setup. Il even record a before and after. Lets settle this for sure.
I have a racing dynamic intercooler and I’m hitting 15-15.5 lbs of boost, with the stock one I see 16-16.5. I found that I was loosing boost on the hot side intercooler boot using either the stock or Alta boots. I don’t think you're loosing 3 psi, but .5-1 lbs wouldn’t be too far off.
Im going to trust you on this one and report my findings. Im ordering a stock jcw ic on ebay right now. 40 plus 20 shipping. Lets see if I can peak over 15psi WOT on that setup. Il even record a before and after. Lets settle this for sure.
FYI, JCW and S intercoolers are the same. For those reading in the future, Don’t pay more for JCW in the listings title. You didn’t over pay by much but $20 shipping was sans lube.
I have a racing dynamic intercooler and I’m hitting 15-15.5 lbs of boost, with the stock one I see 16-16.5. I found that I was loosing boost on the hot side intercooler boot using either the stock or Alta boots. I don’t think you're loosing 3 psi, but .5-1 lbs wouldn’t be too far off.
ooooooo interesting! I believe thats the same intercooler I have. I like the look and all but its all about performance lets see what the outcome is.
FYI, JCW and S intercoolers are the same. For those reading in the future, Don’t pay more for JCW in the listings title. You didn’t over pay by much but $20 shipping was sans lube.
Sick Mini! Also thanks for that info. I have to purchase another intercooler because the seller declined my offer :( And I want one that doesn't have all the fins bent haha.
So since I knew where mine was leaking from, and i didn't feel like trying to fix it. I swapped back to the stock intercooler and boots. This morning, 32 degrees, hit 17 lbs of boost in 3rd and 4th.
So since I knew where mine was leaking from, and i didn't feel like trying to fix it. I swapped back to the stock intercooler and boots. This morning, 32 degrees, hit 17 lbs of boost in 3rd and 4th.
ah now the plot thickens. I was thinking if the the 1 lb of boost loss is worth the cooler air temps?? Are the air temps cooler on the bigger intercooler?
ah now the plot thickens. I was thinking if the the 1 lb of boost loss is worth the cooler air temps?? Are the air temps cooler on the bigger intercooler?
just from my brief time with the racing dynamics, i ran a whole dragon weekend with it, this was with alta boots. i was peaking at 15.5 lbs of boost, temps 30 -75 out. i wasnt really watch temps too much, more concentrated on driving. this morning it was 30 degrees, i actually let the car warm up water 180 and oil was above 100 and starting to climb. IAT was 98 when i left the house, driving 35 mph for about a mile 1at was 80 and dropping. 2 miles later i started to get to the highway and was down to 50. 17lbs of boost again, wasnt worried about intake temps. im not messing around with the intercooler if i dont need to, i seem to have everything back in working order.
ah now the plot thickens. I was thinking if the the 1 lb of boost loss is worth the cooler air temps?? Are the air temps cooler on the bigger intercooler?
it only runs cooler because it runs less boost.
Our cars don't start pulling timing until the iat reaches 160'F.. so if your not seeing anything above that , you have nothing to fret about..
and no , under NO circumstance will an ebay or even a racing dynamics ( ebay ic with a logo and jacked up price ) make more power than a stock ic..
trust me , my enginesea pretty indepth build..I've tested numerous numerous intercoolers on it , PERSONALLY . Im not telling you some he said she said ******** man , I only speak what I know or I won't say anything at all..
here's my car pulling btw. Lol I do know how to make these engines scream !
