LeeM Posted 21November, 2020 Report Share Posted 21November, 2020 1 minute ago, MFX said: Stainless is so hard, it would kill a hole saw straight away Oh, stainless? Yeah nah, forget that then 😁 MFX 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 21November, 2020 Author Report Share Posted 21November, 2020 2 minutes ago, LeeM said: Oh, stainless? Yeah nah, forget that then 😁 It would probably do it, but it won't last long. I have learned that I really hate working with stainless LeeM 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 25November, 2020 Author Report Share Posted 25November, 2020 In this episode, I finish off the bi-modal exhaust that I built last week and then Mrs Jeff finally gets to drive Harry 911. SteveF, GTP911, Scott930 and 3 others 5 1 Quote Link to comment Share on other sites More sharing options...
GC9911 Posted 26November, 2020 Report Share Posted 26November, 2020 11 hours ago, MFX said: In this episode, I finish off the bi-modal exhaust that I built last week and then Mrs Jeff finally gets to drive Harry 911. Oh oh, Mrs Jeff needs her own P car, make it happen number 9. MFX 1 Quote Link to comment Share on other sites More sharing options...
LeeM Posted 26November, 2020 Report Share Posted 26November, 2020 That was great mate. Reckon Mrs Jeff has just adopted Harry though! MFX 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 27November, 2020 Author Report Share Posted 27November, 2020 Yeah. She is definitely a convert LeeM 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 17December, 2020 Author Report Share Posted 17December, 2020 This week I get back into wiring on Harry 911, adding a MAP sensor and Cruise control?! Carrera28, Scott930 and tomo 2 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 2January, 2021 Author Report Share Posted 2January, 2021 This week I go through and start prepping Harry 911 for the track, including fitting harnesses, adjusting the valve lash and fitting a fire extinguisher bracket. Scott930 and tomo 1 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 6January, 2021 Author Report Share Posted 6January, 2021 It is finally time to get Harry 911 back on the dyno for the full tune, but it doesn't all go as I hoped. GTP911, tomo and Scott930 3 Quote Link to comment Share on other sites More sharing options...
Mike D'Silva Posted 6January, 2021 Report Share Posted 6January, 2021 Put it on an American dyno... extra 30hp Different temperatures on different days? What lambda/afr was he targeting? If it feels fast, forget about the dyno chart.. drive the car and enjoy it. Sounds like it's an honest sub 200... lots of dynos read a lot higher to make the owners feel better about parting with their money. MFX and Peter M 1 1 Quote Link to comment Share on other sites More sharing options...
OZ930 Posted 6January, 2021 Report Share Posted 6January, 2021 Didn’t you play with the exhaust between dyno checks ? May have disturbed something ?? just a random thought MFX 1 Quote Link to comment Share on other sites More sharing options...
Coastr Posted 6January, 2021 Report Share Posted 6January, 2021 1 hour ago, OZ930 said: Didn’t you play with the exhaust between dyno checks ? May have disturbed something ?? just a random thought Was my first thought as well. Bound to be exhaust related. MFX 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 6January, 2021 Author Report Share Posted 6January, 2021 7 hours ago, OZ930 said: Didn’t you play with the exhaust between dyno checks ? May have disturbed something ?? just a random thought I did, but all I really did was add in the V band clamps. As my bi-modal exhaust didn't work I have just been running the old unit as it sounds much better. Quote Link to comment Share on other sites More sharing options...
LeeM Posted 6January, 2021 Report Share Posted 6January, 2021 You need some megaphones Jeff. Free that sucker up, and enjoy the symphony of an open piped flat 6 whilst causing tinnitus to anyone you pass by within 10 metres 👍 MFX 1 Quote Link to comment Share on other sites More sharing options...
OZ930 Posted 7January, 2021 Report Share Posted 7January, 2021 There is also the cruise control instal and you let Mrs Jeff drive it !! 😂😂😂 MFX 1 Quote Link to comment Share on other sites More sharing options...
Peter M Posted 7January, 2021 Report Share Posted 7January, 2021 23 hours ago, MFX said: It is finally time to get Harry 911 back on the dyno for the full tune, but it doesn't all go as I hoped. Jeff, Don't let the fake news of the US forums get you down, your engine isn't shabby at all. 197 Mainline rwhp = 230 Dynojet rwhp = 265 Dynojet fwhp if you use the commonly accepted "conversion factors. That's common 3.2SS/3.4 territory plus you have another 1000rpm usable revs! As for the difference you really need to look at the factors that Mike listed above plus humidity, air pressure and your various tuners willingness to court knock. The change in tie down could also be the difference too. Horsepower Dyno Readings, USA compared to AUS, et. al. (hpacademy.com) 911Chips - Porsche Dyno Runs MFX 1 Quote Link to comment Share on other sites More sharing options...
Mike D'Silva Posted 7January, 2021 Report Share Posted 7January, 2021 I still say, you should try a quality set of headers. And run open pipes for the dyno. Just to see if you can rule out exhaust as a limiting factor. Our n/a cars are fairly sensitive to exhaust changes. It is possible with the cams and headwork, that your stock headers (I think they are stock?) are strangling it at higher rpm. Low down is fine and I imagine it feels quite torquey.. the smaller diameter pipe might be give you a higher gas velocity.. but isn't able to flow the volume the motor needs at high rpm? Cam timing also plays a part.. advance the cam to give more torque down low, but less top end HP. Retard the cam to go the other way.. but I imagine those cams were designed to run at a fairly specific setting. Just an opinion... MFX 1 Quote Link to comment Share on other sites More sharing options...
MFX Posted 7January, 2021 Author Report Share Posted 7January, 2021 1 hour ago, Mike D'Silva said: I still say, you should try a quality set of headers. And run open pipes for the dyno. Just to see if you can rule out exhaust as a limiting factor. Our n/a cars are fairly sensitive to exhaust changes. It is possible with the cams and headwork, that your stock headers (I think they are stock?) are strangling it at higher rpm. Low down is fine and I imagine it feels quite torquey.. the smaller diameter pipe might be give you a higher gas velocity.. but isn't able to flow the volume the motor needs at high rpm? Cam timing also plays a part.. advance the cam to give more torque down low, but less top end HP. Retard the cam to go the other way.. but I imagine those cams were designed to run at a fairly specific setting. Just an opinion... It definitely could be the exhaust. I have no idea if my headers are stock, but I don't think so as they did not have heat exchangers. Cam timing is something I could definitely tweak, but I am not that keen to pull the engine down again at this stage. I would prefer to do whatever external tests I can do first. Either way I am in no hurry as it still drives great and I just want to enjoy it a bit for a while Grimmy and LeeM 2 Quote Link to comment Share on other sites More sharing options...
MFX Posted 11January, 2021 Author Report Share Posted 11January, 2021 It is finally completed and on the road. Here is the full summary of 5 years of work building my dream Porsche 911 in my home garage. firstone, Scott930, LeeM and 12 others 15 Quote Link to comment Share on other sites More sharing options...
michel Posted 11January, 2021 Report Share Posted 11January, 2021 Well done sir ... 5 years . Well celebrate at the next wee jasper camp out in autumn . Only thing now to do is to tweak the driver GC9911 and MFX 1 1 Quote Link to comment Share on other sites More sharing options...
firstone Posted 11January, 2021 Report Share Posted 11January, 2021 Fk that's a lot of work. The smiles at the end say it all. MFX 1 Quote Link to comment Share on other sites More sharing options...
LeeM Posted 11January, 2021 Report Share Posted 11January, 2021 You've come a long long way mate 👏👏👏 MFX 1 Quote Link to comment Share on other sites More sharing options...
Philbee Posted 11January, 2021 Report Share Posted 11January, 2021 🏆🏆🏆 .... congratulations Jeff. I bought my car 4.5yrs ago and started on the forum watching your vids. Finally we all get to see the completion of this great story. my hat is off to you, sir. Well done. philbee LeeM and MFX 2 Quote Link to comment Share on other sites More sharing options...
Carrera28 Posted 11January, 2021 Report Share Posted 11January, 2021 This should be the video to get you to 100,000 subscribers and I suspect a lot more 👍 MFX 1 Quote Link to comment Share on other sites More sharing options...
Coastr Posted 11January, 2021 Report Share Posted 11January, 2021 I remember when you first started posting I thought ‘can’t he just post some pictures like a normal person?’ Now I watch every week like a weirdo. Well done - can you explain why the 100k is so important? I assume it’s ore than a plaque. MFX 1 Quote Link to comment Share on other sites More sharing options...
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