herbiemercman Posted March 3, 2020 Share Posted March 3, 2020 (edited) Hi Guys, It took me 3 years from the NAT Conversion being fitted for me to realize the importance of fitting an AFR Gauge, which i carried out yesterday, it is a "AEMelectronics" wideband which provides quantatative data, digital and LED. It was £200 and comes with the advanced Bosch sensor. Basically the Converter, "Rocket Dog Racing" told me that a boost gauge and an AFR were a "nice to have", but not essential as he was happy to let the MAP provide the protection required. So 3 years on and i now have a thicker cylinder head gasket and a "Jap Parts" 3" free flow exhaust system, i received different views as to how the two changes could affect my MAP, this included the opinion from the NAT Converter. After experiencing a loss of boost caused by a wide split in the boost pipe and following this a sticking waste gate, again loss of boost, i managed to get a full performance recovery to the engines power output, circa 415 BHP at 1.2 Bar, smooth running and bags of power. Noz and one or two other members, from their experience and know how, convinced me that an AFR gauge is a must, their hypothesis was that if something in the fueling systems control, sensors, continuity problems, poor quality fuel etc caused the engine to run lean, eg: 18 to 1. air to fuel mixture, then the aluminium in the combustion chamber could warp or melt, which would be a worse case scanairio than the cylinder head gasket failing, which is an expensive difficult high tech job to do. The engine runs from a cold start at 12 to 1, and then cruises at 14.5 to 1, and on full boost circa 11 to 1, it is spot on and i enjoy knowing that this important condition is running correctly. Herbie. AEM.AFR (1).jpg (446.6 KB) AEM.AFR (2).jpg (441.3 KB) AFR Sender.jpg (564.0 KB) Edited April 8, 2020 by herbiemercman numerical mistake on full boost pressure. (see edit history) Quote Link to comment Share on other sites More sharing options...
Noz Posted March 3, 2020 Share Posted March 3, 2020 Herbie. Try and keep all of this info to one thread. It gets tough trying to keep track. Circa 15 to 1 on full boost is lean. Google what you should be getting as a targer. Report back! Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted March 3, 2020 Share Posted March 3, 2020 haha 15:1 on full boost. my god. please take this car to get tuned before you melt a piston. Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted March 3, 2020 Share Posted March 3, 2020 Good god Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted March 3, 2020 Share Posted March 3, 2020 I'd stop boosting if youre getting 15:1 ratio, it should be 11 or 12:1 Quote Link to comment Share on other sites More sharing options...
sebas Posted March 3, 2020 Share Posted March 3, 2020 mine is close to 11:1 wheen on full boost. 15:1 is way too lean Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted March 3, 2020 Share Posted March 3, 2020 I wouldn't be surprised if you were actually making more power than 415hp with such a lean piston melting mixture. Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted March 3, 2020 Share Posted March 3, 2020 I wouldn't be surprised if you were actually making more power than 415hp with such a lean piston melting mixture. Peak power mixture is around 12:5. Though not much safety margin at this level. Better for road cars to find themselves in the 11.5-12 range. So correct in thinking that going leaner will actually be detrimental to power. I'm assuming he is still running stock NA 330cc injectors. If so then definitely won't be close to 415hp. Quote Link to comment Share on other sites More sharing options...
Noz Posted March 3, 2020 Share Posted March 3, 2020 Herb. The T61 usually gives around 500hp at 1 bar. Not sure what turbo you've got. You have a boost gauge or controller? I have a similar sized turbo and 1.2 bar gives me 600hp. Quote Link to comment Share on other sites More sharing options...
Style Posted March 4, 2020 Share Posted March 4, 2020 Christ on a bike. I’m amazed the engine hasn’t let go already tbh Need to get the car tuned ASAP mate Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted March 4, 2020 Author Share Posted March 4, 2020 Hi guys, I have been a right prick here and unwittingly started "a storm in a tea cup". My previous readings were on the day i fitted the AFR and it was just basically close to where i live and to be honest i only caught a glance of the highest reading of 15 to 1 for a split second. Today i went on the M65 and it was very quiet to carry out a more meaningful test run, here are the readings AFR's recorded: COLD START: 14 TO 1. ENGINE TICK OVER UP TO TEMP AND OIL TEMP AT 90DEG.C: 14.8 TO 1. HALF THROTTLE 5TH GEAR: 90 MPH ISH: 12.5 TO 1. BOOT DOWN SILLY SPEED: 11 TO 1. The readings held steady for for a while at least one mile or so at high speed. The 15 to 1 occurs momentarily when you are de-cellerating and this is where the gauge starts to fluctuate a little, when you shut off completely there are no readings which is understandable. So thank you for the posts and join me in my celabration, i must admit i could not wait this morning after what Noz told me about the leaning out, to carry out a proper test run. Herbie. Quote Link to comment Share on other sites More sharing options...
Burna Posted March 4, 2020 Share Posted March 4, 2020 (edited) Edit: Just seen your above post, and that seems more like the readings you should see Edited March 4, 2020 by Burna (see edit history) Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted March 4, 2020 Share Posted March 4, 2020 You're going to end up giving us heart attacks, Herb. Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted March 4, 2020 Author Share Posted March 4, 2020 Thank you Burna and Adam. Herbie. Quote Link to comment Share on other sites More sharing options...
Noz Posted March 5, 2020 Share Posted March 5, 2020 Well done mate. This was a good update. Very methodical and to the point. Good to see it's as desired. What's the next hurdle? Apart from the RS badge Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted March 5, 2020 Author Share Posted March 5, 2020 Cheers Noz, Looks like i got there in the end, just got to parcel up my RS badge now and mail it to Adam, RS (Rallye Supra) models are quite sought after. lol. Herbie. Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted March 5, 2020 Share Posted March 5, 2020 Thank you for your kind offer but I think it would probably better suit the club car! Quote Link to comment Share on other sites More sharing options...
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